Imos 812
Still stuck on a few:
1a Level and clear (8) B?S?????
13a Made powerless (9) ??M?T???G
17a Anyone uncritically admired (4) ???N
20a Head of cult, say (4,6) ?I?H,?R???T
Will start with my across clues and come back if still stuck on the down clues ;)