1: Church assembly contributing to heresy? No dice! (5)
4: One country or another entertains Jolson (9)
8: Polygraph unexpectedly traps vandal (3)
9: Messages transmitted about a mile (1-4)
10: Got excited by unusual tulip (3,2)
11: Man, having taken a dose of LSD, is overcome by dread in a world of shadows (9)
12: Before time like an aristocrat? (5)
14: 'Strike!' the French yell (4,3)
15: Unknown little princess turning food with tongue (7)
18: Tarpon's head is covered by more opulent kind of scale (7)
20: Al Fresco is to do our cooking (7)
21: Unscripted part for head librarian (2,3)
23: Smear record colour - that one (9)
24: Prepare canvas with a colour like red, blue or yellow? (5)
25: . . . or working with one group of stars (5)
27: Mikes good tackling ice tower (6,3)
28: Padre's sensibly covering attire (5)