Inaudible (6)

I believe the answer is:

silent

'inaudible' is the definition.
(similar in meaning)

This is the entire clue.

(Other definitions for silent that I've seen before include "Taciturn" , "Refusing to communicate" , "Lacking sound" , "Enlist (anag) - mum" , "Utterly quiet" .)

I've seen this clue in The Telegraph.

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