Across
Nameless clarinetist perhaps performing in concert (10)
Nitrogen in cigarette that delivers poison (4)
I want a little something immediately (5)
Always behind rear of column: not again! (9)
Plausibly, rains ruined army training here (9,5)
Native American chief's first love arrested by guard taken back (7)
I haven't cracked this one yet — but Times for the Times have:
C[hief], then WATCH (guard) reversed with O inside.
Look after youngster grabbing one whiskey that's downed (4,3)
Insects eating live one of the Scorpion group (7)
Aircraft following large boat, heading off (7)
I haven't cracked this one yet — but Times for the Times have:
F[ollowing], [FRE]IGHTER. Or, as others prefer below, [L]IGHTER.
Leave London, hoping to be returned? (2,2,3,7)
Abuse involving American pair leading orchestra and conductor? Absolutely not (9)
I haven't cracked this one yet — but Times for the Times have:
INSULT (abuse) has A[merican] inserted, then OR[chestra].
Hot island? One part of island (5)
Artist's spiritual exercises transferring pieces in odd places (4)
I haven't cracked this one yet — but Times for the Times have:
YOGA changes first and third letters round.
One has confidence in investments (4,6)
Down
Capital of two US states (4)
Happen to turn round (4,5)
Play awful when trite and no longer fresh (3,7,4)
Weapon for which one keeps one's head down a good while? (7)
More than one cut, not quite every one (7)
Past river, a market (5)
With vegetables, pull up grass (10)
Leaving an unfinished task and settling down (8,6)
Go canoeing for relaxation, but not in such a craft (5-5)
Stories about endlessly pompous rituals (9)
Postponed decision about small particle (5,2)
Wrong order at first of rising problem in flock (4,3)
I haven't cracked this one yet — but Times for the Times have:
all reversed, TORT (wrong), O[rder], OF.
Delicious pie with a different crust (5)
I haven't cracked this one yet — but Times for the Times have:
PASTY changes P to T.
Not straight, because bent (4)
Type letters or click words in the clue