Across
Drop is put into drink (6)
23d
Oxygen-fuelled lifting device found after little time – not long? (3-4)
I haven't cracked this one yet — but Fifteensquared have:
O (oxygen) in WINCH (lifting device) after T (little time)
Gentleman sent back in exchange for lawyer (9)
I haven't cracked this one yet — but Fifteensquared have:
A reversal (sent back) of SIR (gentleman) in BARTER (exchange)
Excitable, somewhat touchy perhaps (5)
See 28
Cook tries open sandwich (9)
It becomes more peaceful for wild animals (7)
Hands down back of settee, a number of items not quite retrieved, unknown quantity (6)
I haven't cracked this one yet — but Fifteensquared have:
[setteE] + a reversal (retrieved) of LIS[t] (number of items, not quite) + Y (unknown quantity) – read rather like a telegram, this paints a recognisable picture: we’ve all been there, I’m sure
Leader in Russian preserved by a paper, still (2,4)
I haven't cracked this one yet — but Fifteensquared have:
R[ussian] in A TEST (a paper)
A cruciverbalist residing in Split given new identity (7)
I haven't cracked this one yet — but Fifteensquared have:
A + ME (cruciverbalist) in REND (split)
Travelling in car, thunderous – if so, what’s up? (4,5)
Bump on the rear sounded – little accident (5)
I haven't cracked this one yet — but Fifteensquared have:
[bum]P + RANG (sounded)
Hunter with shaved head, one might be bald (5)
Shame miserable clothing is being worn by husband (9)
I haven't cracked this one yet — but Fifteensquared have:
DOUR (miserable) round (clothing) IS, all round (being worn by) H (husband) Edit: thanks to KVa @2 for the correct parsing
11a
Corner insert fit for pocketed item? (7,5)
Balance at the limits having sex on your bike! (4,2)
Down
Section in contract withdrawn (7)
Remove untidy vegetation (5)
See 14
Insolence shown after performance: Congress let it go (4,3,5,5)
See 4
Short investigation into fruit served up for a piece of cake (2,7)
I haven't cracked this one yet — but Fifteensquared have:
PROB[e] (investigation, short) in a reversal (served up) of MELON (fruit)
String runs through pipes (6)
*one* flight (6)
25d
Average postcard unnecessary then? (7,2,5,4,5)
Cock-up over character without children (4,5)
As requested, 19 down pulled up? (2,5)
I haven't cracked this one yet — but Fifteensquared have:
A reversal (pulled up) of RED ROOT (the answer to 19dn is RADISH)
Edible plant, a food under review, originally (6)
I haven't cracked this one yet — but Fifteensquared have:
R[eview] + A + DISH (food)
Follow communist, gentle pace (7)
Pants, where fire breaks out in lying? (6)
See 4
See 14
Type letters or click words in the clue