ACROSS
1 Forced to accept order under contract (8)
PROMISED – PRISED [forced] to accept OM [order (of merit)]
9 Several deliveries arrived crushed (8)
OVERCAME – OVER CAME [several deliveries | arrived]. FOI
10 Briefly turn down side road (4)
SPUR – SPUR{n}
11 Performing insect begged for food (4,8)
EGGS BENEDICT – (INSECT BEGGED*). Took me awhile to shake the idea of FLEA something…
13 Decrepit little bird found on step (4,2)
PAST IT – TIT found on PAS. SOI
14 Ravel‘s standpoint on hospital discipline? (8)
ENTANGLE – if you have an E.N.T. (Ears, Nose & Throat) ANGLE…
15 Weak, though extremely willing (7)
THREADY – T{houg}H + READY. A thready pulse is a weak one, apparently.
16 A dry agency worker’s parting shot (7)
ATTEMPT – A TT [a | dry], “parted” by TEMP
20 I’ll appear in another novel, perhaps (8)
ANTIHERO – I, “appearing in” (ANOTHER*), semi-&lit. If all novels contained antiheroes this would’ve been an &lit!
22 Adjust to correct position, touching bottom (6)
RESEAT – RE [touching] + SEAT [bottom]. I started with REBASE in here and this ended up my LOI.
23 Riskily meddle in passionate drama? (4,4,4)
PLAY WITH FIRE – which could alternative be a PLAY that has some FIRE in it
25 Italian banker‘s Oscar-nominated part (4)
ARNO – hidden in {osc}AR-NO{minated}. A Tuscan river (you can certainly bank on rivers), that flows beneath the Ponte Vecchio in Florence.
26 Old papers in many cases (8)
OFTTIMES – O [old] + FT, TIMES [(two) papers]
27 Wasn’t emu originally a flier? (4,4)
MUTE SWAN – (WASN’T EMU*). Swans are some of the largest birds that can actually fly, I believe, certainly top ten list material.
DOWN
2 Find fault with expert in orbit (8)
REPROACH – PRO in REACH
3 Sir Thomas’s quarry bagged by our opponents, sadly (5,3,4)
MORE’S THE PITY – (Sir Thomas) MORE’S, plus PIT “bagged” by THEY
4 Large plugs seen and disregarded (8)
SLIGHTED – L “plugs” SIGHTED
5 Match that professional’s taken to heart? (7)
DOUBLES – and the centre of {profe}SS{ional} is, as you see, DOUBLE S
6 Edible seed, many of which would yield paltry sum (6)
PEANUT – many of which are PEANUTS, if you pay which, you can have your choice of monkeys or TftT bloggers
7 Under strain, I move slowly on landing (4)
TAXI – under TAX [strain], I
8 Speculation lacking in celebrant’s likely garb (8)
VESTMENT – {in}VESTMENT
12 An age that’s critical during dry season abroad (7,5)
DONKEY’S YEARS – KEY [critical] during (DRY SEASON*)
15 One stirs shortly after meal, papa assumed (8)
TEASPOON – SOON after TEA, “assuming” P
17 Latest spacecraft crossing edge of exosphere on time (8)
TARDIEST – TARDIS crossing E{xosphere} (or perhaps {exospher}E) on T. To describe the TARDIS as a spacecraft is a bit like describing the Titanic as a dinghy, mind you…
18 Where mum joined baby scheme church introduced, with thanks (8)
PLACENTA – PLAN [scheme] has C(hurch of) E(ngland) “introduced”, with TA [thanks]
19 Very quiet man’s initially made a false deduction (7)
SOPHISM – SO P HIS M{ade}
21 Poser trounced in game (6)
ENIGMA – (IN GAME*)
24 Decline of oxygen in kiln is concerning (2,2)
AS TO – take an OAST, and “decline” the O(xygen) to the very bottom.
I struggled to get EGGS BENEDICT as I hadn’t realised that it was an anagram but I think it deserves to be COD for its deception.
Many thanks to the setter and to Verlaine for the entertainment.
It certainly is – and had me racking my brain for insect names!
Have a great day.