1: Evil colleague, for example, breaking in contrary to law (9)
2: Fold suit and undershirt (5)
3: Shell compensate for loss in certain risky starts (7)
4: Stretched form of a verb (5)
5: 20-down 21-down to rush a grand relly (18)
6: Dilapidated sofa contained initially some hot embers: something's burnt remains. (5, 2)
7: Law, say, constraining trade union leaders (7)
8: Elected to instruct audit of electronic giant (5)
12: Prig had ma conceal midriff (9)
14: Difficult newspaper or novel (4,5)
16: Bitter expert with broken crib (7)
17: Clip of Southern Conservative is very revealing at first (7)
19: Dog (cross) exacerbated 16-down (7)
20: Studio sign initially obscured by swirling rain (2,3)
21: Demonstrated the way in which to keep poles apart (5)
22: Bolted up tiptop earthenware (5)