Her denial is in a whisper (3)

I believe the answer is:

his

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'her denial' is the definition.
I can't judge whether this defines the answer.

'in a whisper' is the wordplay.
'in' indicates the answer is hidden within the clue.
'HIS' is hidden within 'whisper'.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for his that I've seen before include "That man's" , "Belonging to that man" , "that chap's" , "Belonging to the male" , "To - Coy Mistress (Marvell)" .)

I've seen this clue in the Evening Standard.

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