License uncommon hush (7)

I believe the answer is:

silence

'hush' is the definition.
(I know that hush can be written as silence)

'license uncommon' is the wordplay.
'uncommon' indicates an anagram.
'license' is an anagram of 'SILENCE'.

(Other definitions for silence that I've seen before include "Absence of racket" , "'The rest is - - '(Hamlet)" , "What's left of burnt coal" , "Gag" , "Lack of sound" .)

I've seen this clue in The Mirror.

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