Audacity of woman about to destroy notes (10)

'audacity' is the definition.
(thesaurus)

'woman about to destroy notes' is the wordplay.
I cannot really see how this works, but
'about' could be 'a' (abbreviation in Chambers) and 'a' is located in the answer.
'notes' could be 'nn' (I've seen this in other clues) and 'nn' is found in the answer.
This may be the basis of clue (or it may be nonsense).

'of' acts as a link.