Cannot fathom these:-
1a.Fictional character from Spooner's island, amusing to listen to(6,5) ????E? ??T?Y
9a.Roman conspirator gets nothing for a barge(5)????O
17a. I have Pepperoni but cannot see why!
21a. Deputy head with old coin bargains about Russian classic(4,5)??A? 5
26a. Dogged investigator?(6,5)????T? 5
23d. Bear enclosure(5) 5