1: Evil twin and its dupes (7)
5: Make money and set out to be serious (7)
9: He's not joking, it's completely lawless. (2, 3)
10: Evil colleague, for example, breaking in contrary to law (9)
11: One final, huge Greek goddess (3)
12: Revolver pointing up and down (7)
17: Surprisingly tautest act (7)
18: Garments for many knights, thanks to British poets (7)
19: Rule violater alarming teacher (7)
20: Expert in scriptural interpretation in Devon River to fetch sweetheart (7)
21: Certain engines stall less jerkily (7)
22: Reportedly is nostalgic for wife (3)
23: Very clever fish ain't at sea (9)
27: Record left by teacher in Siam (5)
28: Drunkard turns to observe drunkard (7)
29: Apparent place in the tall grass (7)