Bird that can be mute? (4)

I believe the answer is:

swan

(Other definitions for swan that I've seen before include "Sweet name 8 [OF SHAKESPEARE]" , "Cob - pen" , "Mute, whooper or Bewick's bird" , "Large, web-footed bird" , "black, in 7th" .)

I've seen this clue in The Guardian.

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