Not so noisy (5)

I believe the answer is:

muted

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'noisy' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

I can't explain the rest of the clue.

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(Other definitions for muted that I've seen before include "Not loud" , "Quiet or muffled" , "with reduced volume" , "Soft-pedalled" , "Soft" .)

I've seen this clue in the Evening Standard.

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