Silent sort of swan (4)

I believe the answer is:

mute

I believe this clue is a double definition.

'silent' is the first definition.
(I know that silent can be written as mute)

'sort of swan' is the second definition.

(Other definitions for mute that I've seen before include "Speechless, soundless" , "Unable to speak" , "Silent, not talking" , "Soften the sound" , "Unspeaking" .)

I've seen this clue in The Mirror.

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