1: Double profit repeatedly (5,3,5)
6: Spider, e.g., caught a foremost kite's sail (9)
7: Old-fashioned pastor has dined inside (5)
10: One who leads many after something irrational. (5)
11: Upright drunk's interjection interrupts the others briefly (7)
12: Roman light and gold found in Egyptian town. (5)
13: Praises cricket ground in a speech (5)
14: Empty pail beneath sack (7)
18: Going after the final piece of puzzle for a very long time (3)
19: Culpability starts to goad us into leaving town (5)
20: Woman losing head after another fall (9)
21: Ball-horses are travellers! (5-8)