Silent sort of swan (4)

I believe the answer is:

mute

I believe this is a double definition.

'silent' is the first definition.
(synonyms)

'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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