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I am stuck on a few,

1 across, thump (5) I have C?O??
9 across, to aid (2.3.8,20 i have I? T?? ?N?E?E?T ?F
12 across, Regretful acknowledgement of an error I have A?O???Y
22 across Certainty (4,5) ??R? T?I?G
17 down Nourish or Incur (7) I have S???A?N
22 down Filmy or pure (5) I have S?E?R

Any help please?

22a sure thing
22d sheer
17 sustain

1a clout

9a in the interest of?

Thank you all a great help !