Times Cryptic Jumbo 1509: Espress Permission

I mostly liked 37ac and the cedilla and ESP clues were sort of fun, but one simply must draw the line at “linu ron” and the caving in to “expresso”: this is the Times, some standards must be maintained . Thank you setter for the Saturday fun though despite these brow-wrinklers!

Definitions underlined, (ABC)* indicating anagram of ABC, {} deletions and [] other indicators.

Across
1 Sailor and soldier regularly unload arthropod (9)
TARANTULA – TAR and ANT + U{n}L{o}A{d}
6 Quiet American, sick with hatred, takes in old and timid (13)
PUSILLANIMOUS – P US, ILL with ANIMUS, “takes in” O
13 A bunch of well-read librarians wing it (2-3)
AD-LIB – hidden in {well-re}AD LIB{rarians}
14 Victory impresses more trendy assistant in hunt (7-2)
WHIPPER-IN – WIN “impresses” HIPPER
15 Author about to block old censor and senator finally (7)
CREATOR – RE “blocking” CATO + {senato}R
16 The incredible awareness at the heart of Shakespeare (12,10)
EXTRASENSORY PERCEPTION – hidden in abbreviated form in {shak}ESP{eare}
18 Idiots undermine bills ambassador introduced (8)
SAPHEADS – SAP ADS, “introducing” H.E.
20 Bizarre account involving old form of fruit (8)
COCOANUT – (ACCOUNT*) “involving” O
21 A lot of sailors grasping firm bit of mast (5)
ACORN – A R.N. “grasping” CO
23 Notice present then past feature in playground (6)
SEESAW – present tense then past tense of SEE [notice]
24 Wet blanket near person at end of day (6)
MISERY – MISER (as “near” = stingy) at {da}Y
25 Fleet Street record dance (9)
QUICKSTEP – QUICK ST EP [fleet | street | record]
28 Calm down one in a key state after rioting (4,2,4)
TAKE IT EASY – I in (A KEY STATE*)
29 “Cicero is an orator first and foremost!” Roman cheers (4)
CIAO – C{icero} I{s} A{n} O{rator}. Italian for “seeya”
30 Couple hold nerve withdrawing farm job (7)
TILLAGE – TIE [couple] “hold” (though really “holds”, surely?) reversed GALL
32 This writer’s probing unfit revolutionary instruments (7)
TIMPANI – I’M [this writer is] “probing” reversed INAPT
34 Flat sporting occasion curtailed (4)
EVEN – EVEN{t}
35 In Arctic ground I had added corrosive chemical (6,4)
NITRIC ACID – (IN ARCTIC*) + I’D
38 Large snake in garden initially gives problem with hose (9)
LADDERING – L ADDER IN G{arden}
39 French president takes off glove for trip (6)
ERRAND – {mitt}ERRAND
40 Small extremely clumsy article one’s used for cutting (6)
SCYTHE – S C{lums}Y THE
43 It secures victory in time that’s empty (5)
TWINE – WIN in T{im}E
45 Is blinking big cat occasionally caught in rump? (8)
NICTATES – {b}I{g} C{a}T in NATES
47 Ten tucked into beer with lime, say, in bar on coach (8)
AXLETREE – X “tucked into” ALE + TREE
49 Relish standardising nosh cooked with dulse (8,6,8)
THOUSAND ISLAND DRESSING – (STANDARDISING NOSH + DULCE*)
52 Antarctic explorer in India? Tell composer (7)
ROSSINI – ROSS IN I. Wrote the opera William Tell
53 Poor state university function in deficit (9)
LOUSINESS – U SINE in LOSS
54 Collapsing out of bounds, exhausted (3,2)
ALL IN – {f}ALLIN{g}
55 Enlarging vein somehow the result of using needle (4,9)
LINE ENGRAVING – (ENLARGING VEIN*)
56 Dealing online, English come across German car (1-8)
E-COMMERCE – E COME “across” MERC
Down
1 Crosses put up around Republican states (9)
TRAVERSES – reversed SET “around” R AVERS
2 Bureau Trollope’s crazy daughter put in at end of week (4-3,4)
ROLL-TOP DESK – (TROLLOPE’S*), with D “put in”, at {wee}K
3 Old part of Africa now under boats in Aswan primarily (5)
NUBIA – N{ow} U{nder} B{oats} I{n} A{swan}
4 Peace-keepers, furious about eastern Yankee, hard to handle (8)
UNWIELDY – UN + WILD “about” E + Y
5 Surrounded by 500 in a film (6)
AMIDST – D in a MIST
6 Decorate unit inspired by my notes (5,5)
PAPER MONEY – PAPER + ONE “inspired by” MY
7 My nicest port dissolved drug (12)
STREPTOMYCIN – (MY NICEST PORT*)
8 Herbicide used up in kindergarten or uni lawns (4,3)
LINU RON – Never heard of this before and not quite sure why it has been enumerated as (4, 3) but it’s hidden reversed in {kindergarte}N OR UNI L{awns} so there’s nothing but to do but put the letters in, nod and smile
9 Old standard bearer fellow’s one on the right: we all know that? (7,7)
ANCIENT HISTORY – ANCIENT HIS TORY [old standard bearer | fellow’s | one on the (political) right. I wish everyone DID know ancient history then we might not be doomed to repeat so many mistakes of the past
10 Sloth‘s favourite time to eat it up (7)
INERTIA – IN ERA, “eating” reversed IT
11 Somehow drain tooth around hole, using this treatment? (11)
ORTHODONTIA – (DRAIN TOOTH*) “around” O, semi-&lit
12 Gershwin’s pulled up long garment (4)
SARI – reversed IRA’s
17 A thousand raised fibres and tiny diamonds found in plant (8)
KNAPWEED – K + NAP [raised fibres] + WEE + D
19 Remove European judge jailing a lot of sleuths from the south (9)
ERADICATE – E RATE “jailing” reversed A CID
22 US poet drinks with Austrian composer (8)
GINSBERG – GINS with BERG
25 Result of division not quite worked out (8)
QUOTIENT – (NOT QUITE*)
26 Old unit look into mountain bike (9)
KILOCYCLE – LO “into” K1 CYCLE
27 Comedian is trained by top man for ref’s job (8-6)
DECISION-MAKING – (COMEDIAN IS*) by KING
28 The whole lot write off leaderless City (8)
TOTALITY – TOTAL [write off] + {c}ITY
31 Ace Joss and I wrestling with equine’s indefinable quality (2,2,4,4)
JE NE SAIS QUOI – (A + JOSS + I + EQUINE*)
33 Send up dull latest edition of paper? Poles enjoy it for 6 months (8,3)
MIDNIGHT SUN – reversed DIM + NIGHT SUN
36 Maybe track flier eventually (11)
CATERPILLAR – double def
37 Taking Charlie to empty place for washing gear primarily (10)
FREEBASING – FREE [to empty] + BASIN [place for washing] + G{ear}
41 Coming out, soldiers picked up some DNA around clubs (9)
EMERGENCE – reversed REME + GENE “around” C
42 Old hacks taking old drink (8)
EXPRESSO – EX PRESS taking O. It’s ESPRESSO though dash it all
44 Hard to find our lot in East, as it happens (7)
ELUSIVE – US in E LIVE
46 What leads to some hissing when you call “garçon”? (7)
CEDILLA – Cryptic def: the cedilla being the mark under garçon’s c that makes it sibilant not hard
48 Attach poster before bringing in horse (6)
ADHERE – AD ERE, “bringing in” H
50 Host guru briefly collecting rupees (5)
SWARM – SWAM{i} “collecting” R
51 Flower in the countryside opening out (4)
URAL – {r}URAL; it it was “closing out” the answer could have been IRIS{h}!