Last one, 6d, E.g. sturgeon's pawn otherwise wasted time; I have ?AD?ETT and can find nothing in Chambers, I see that 'time' may be the final T, but any ideas?
14A. Bacchante's last bay and brawl? (4) EVO-.
23A. Indian copper beginning to police a bus system, in short (5) PAI-A.
30A. A poisonous reptile in an Indian tree (5) A-I-A.
27D. British Library concerned with "cesse" (4) --I-.