16d- carol eats a bit of horse- revolting! (8) ?H???I?? - shocking?? hock and sing, but how does that fit with carol in the clue?
21ac - clue about son in poor quality securing device (9) ??I???R?P
22d - tool, one of thirteen? (5) ??A?? - clamp?? I see the 13 amp part, but how does the "cl" fit in?
26ac- channel that's good, say (6) ??T???