1: Sweet stuff to eat around 1991, e.g. (5)
4: Alto I somehow kept in the dark, back during interactive broadcasting (4,5)
9: And not in town, ordinarily (3)
10: Behold grand gold flightless bird, chattering endlessly (9)
11: Though run over again, MP hasn't died (5)
13: How agitated was US snake? (7)
14: Force prisoners to exercise (9)
17: Quietly instigate a witch-hunt (5)
19: Drug problem for 100, in sum (9)
21: Religious observance improves personality a little (7)
23: 'Log-in failed', in technical terms (5)
25: Brown pit, essentially, in exotic green fruit (9)
26: He wrote a bit of poetry! (3)
28: Ambush late-rising with auditors load (3,2,4)
29: One of the Marx brothers making a comeback as talk show host (5)