Stuck on a few to get going:
9a Releases, sets free (9) ??????T?S
14a Sorcery, witchcraft (10) ????????C?
20a Wooden instruments used by Swiss cowherds produce no shrapnel! (10) ???E???R?S
13d Laught hysterically (5,5) ?????,A?O?T
18d Laughs quietly (8) ???C?L?S