1: Balls thrown at gophers (9)
5: Coal remaining at the end of a month (5)
8: Keep rolling and swelling, Doc! (7)
10: Chaps follow Grundy on island course (7)
11: Involving ceremony within Victoria, for one (2,5)
12: Loves turncoat in extremely raunchy speechmaking (7)
13: Looks like an eyesore, sounds like an eyesore (3)
14: Thirteen broken adzes repaired (6,5)
15: Discounting losing one's sense of humour? (8,3)
20: Age of neo-catastrophe? (3)
22: Little bitty lines on a letter from Athens (7)
23: Trail after an uprising beginning to form (7)
24: When you work it out, Alfie, we fish (7)
26: Prudent law enforcers endlessly import information technology (7)
27: Like powerful uncle in Indian state? (5)
28: Happy faces disturb economist (9)