Crossword Genius

A very quiet inclusion for Carol is weakening (7)

Ross

I believe the answer is:

sapping

I'm a little stuck... Click here to teach me more about this clue!

'is weakening' is the definition.
(thesaurus)

'a very quiet inclusion for carol' is the wordplay.
I cannot really see how this works, but
'a' is found in the answer.
'quiet' could be 'pp' (musical abbreviation for pianissimo) and 'pp' is present in the answer.
'carol' could be 'sing' (I've seen this before) and 'sing' is found in the leftover letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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