Definitions underlined, (ABC)* indicating anagram of ABC, {} deletions and [] other indicators.
Across
1 Quiet expert aboard vessel, stylish craft (9)
SPACESHIP – P(iano) ACE “aboad” S.S. plus HIP
6 Book hotel accommodation with flash support for cleaner (10)
BROOMSTICK – B(ook) ROOMS with TICK [flash, as in sec, mo]
12 Opera item limitless selection getting cheers (7)
ARIETTA – {v}ARIET{y} getting TA
13 Figure in Russian history circling European border — this one? (9)
PERIMETER – PETER circling E(uropean) RIM
14 French town’s displays with no end of luxury (5)
ARRAS – ARRA{y}S
16 Representative uncovered person circling a lake in Colorado initially (12)
NATURALISTIC – NATURIST circling A L(ake) + I{n} C{olorado}
17 Support English account penned by academic and cleric (10)
ARCHDEACON – ARCH [support] + E AC “penned” by DON
19 Good worker getting corporation to invest in Russian currency in scramble (5-3-6)
ROUGH-AND-TUMBLE – G HAND getting TUM, “invested” in ROUBLE
22 I sense accommodating half of family would be shocking (8)
INFAMOUS – I NOUS “accommodating” FAM{ily}
24 Kings besetting oil producers for a small amount (6)
KOPECK – OPEC “beset” by K K
25 GP producing notes after key treatment? (5,5)
GRAND PIANO – cryptic def for this instrument which produces notes when one tickles the keys
26 Nice retired performer? (5)
EXACT – or EX-ACT
29 Not often put forward or what’s recalled in another area (4)
RARE – hidden reversed in {anoth}ER AR{ea}
30 Very sweet article for cake decoration (8)
ANGELICA – ANGELIC A
32 Absurd address to judge is keeping most of court in uproar (9)
LUDICROUS – LUD + IS “keeping” (COUR{t}*)
34 Openings channelling right warm material to fire (9)
GRAPESHOT – GAPES “channelling” R + HOT
35 Composer butchers composition (8)
SCHUBERT – (BUTCHERS*)
36 Virile male, not clever, not very good (4)
STUD – STU(pi}D
39 Tom’s first in to clinch bargain (5)
STEAL – T{om} in SEAL
40 Father got bigger, ditching uniform that’s in pieces (10)
FRAGMENTED – FR A{u}GMENTED
42 Former Israeli leader penning second lot of reminiscences (6)
MEMOIR – (Golda) MEIR “penning” MO
44 Yes, a cuckoo with a limp is an obvious target (4,4)
EASY GAME – (YES, A*) + GAME [with a limp]
46 Old place, perhaps not upright, containing a lot of buddleia, rampant (6,8)
LISTED BUILDING – LISTING “containing” (BUDDLEI{a}*)
48 Source of milk and bread you wheeled round? (3-7)
TEA-TROLLEY – TEAT + ROLL + reversed YE, &lit
49 One promoting heathen Greek god suppressed by Protestant (12)
PROPAGANDIST – PAGAN DIS “suppressed” by PROT.
53 Keep at the instructions, say, extracting energy or gas (5)
RADON – R{e}AD ON
54 Women’s greeting given to both sides before game — it’s revolutionary (9)
WHIRLPOOL – W(omen) + HI + R(ight) & L(eft) before POOL
55 Better work on industrial efficiency in the field? (7)
OUTDOOR – OUTDO O(perational) R(esearch)
56 MI5 boss possibly securing shelter for one about to go off? (10)
SLEEPYHEAD – SPY HEAD “securing” LEE. Quite excitingly M was played by Bernard LEE in the early Bond films, a missed cluing opportunity maybe?
57 What sounds like very much a routine wine? (9)
SAUTERNES – homophone of SO TURN [very much | a routine]
Down
1 Metal embedded in stone? That’s some effort (5)
STINT – TIN “embedded” in ST.
2 Dessert served with sweet wine in later upheaval (10)
AFTERSHOCK – AFTERS with HOCK
3 Daughter avoiding carefully describing online business (1-7)
E-TAILING – {d}ETAILING
4 Anticipates chap’s securing work (5)
HOPES – HE’S securing OP
5 Fruit I’m beginning to munch, being outside (9)
PERSIMMON – I’M M{unch}, with PERSON outside
6 Put out male entering bar, falling over (4)
BUMP – M “entering” reversed PUB
7 Dismissed odd bits of curry? Uproar (6)
OUTCRY – OUT [dismissed] C{u}R{r}Y
8 Head of monastery bending religious rule will get dismissal (8,6)
MARCHING ORDERS – M{onastery} ARCHING ORDERS [bending | religious rule]
9 Holiday firm can get excited about composer anniversary finally (6,6)
TRAVEL AGENCY – (CAN GET*) “around” RAVEL + {anniversar}Y
10 Copper pulled up a vehicle over booze (7)
CURACAO – CU + reversed CAR + O(ver)
11 Subordinate cracked — runs for moneylender (10)
PAWNBROKER – PAWN [subordinate] BROKE [cracked] R(uns)
15 Demo is kept up around America: a bit of a headache generally (9)
SINUSITIS – SIT-IN IS, reversed around U.S.
18 Friends turned up a little hastily (8)
SLAPDASH – reversed PALS + DASH [a little]
20 WHAT’S IN THE OVERHEAD LOCKER? (5,4)
UPPER CASE – cryptic def. One keeps a case in a locker, and a case in a high-up locker may be upper
21 Cost of hiring hill maybe involving one is falling fast? (10)
TORRENTIAL – TOR RENTAL (!) “involving” I
23 Newspaper and book to peruse: that’ll keep you going (5,5)
DAILY BREAD – DAILY [newspaper] + B(ook) to READ
27 Excellent soldiers I placed around castle, with stronger reason (1,8)
A FORTIORI – A1 O(ther) R(anks) I, placed around FOR
28 Expecting providing obstruction will restrict line (2,3,6,3)
IN THE FAMILY WAY – IN THE WAY [providing obstruction] “restricting” FAMILY [line]
31 Very good to engage in popular craze, eradicating a problem with sleeping (8)
INSOMNIA – SO [very good] “engaging in” IN M{a}NIA
33 Aggression erupting in Greece following alarm (12)
BELLIGERENCE – (IN GREECE*) following BELL
34 Spectators run to embrace tennis great —- it expresses warmth (3,6)
GAS HEATER – GATE R(un) “embracing” (Arthur) ASHE
37 Join Labour, say, upset over a right-winger being insulting (10)
DEROGATORY – GO RED reversed, over A TORY
38 New Zealand city very familiar with good fashion (10)
WELLINGTON – WELL IN with G(ood) TON
41 Disreputable number taking top prize, eliminating first three (9)
NOTORIOUS – NO. + {vic}TORIOUS
43 Bribe for radio announcer not reduced? It should be stopped (8)
BUNGHOLE – BUNG + homophone of WHOLE
45 Possibly not full scale outrage (7)
SCANDAL – reverse cryptic: SCAL{e} = S, C, AND A L (!)
47 Weak with age, from date around zero? (6)
SENILE – SEE around NIL
50 A sauce served up with Uruguay’s foremost rice dish (5)
PILAU – A LIP reversed + U{ruguay}
51 Only partially fair on soccer clubs (5)
IRONS – hidden in {fa}IR ON S{occer}
52 Happy head of BBC is upset about French article (4)
GLAD – reversed D(irector) G(eneral) “about” LA
At 38d why does TON=fashion?
I got to 51d (IRONS) with West Ham (soccer club), known as Irons.
LOI NHO ARIETTA.
It’s French, as in “haut ton” (high fashion) and “le bon ton” (good taste).