Symbol of grace (4)
I believe the answer is:
swan
'symbol of grace' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for swan that I've seen before include "Kind of song, in the end" , "Large water bird" , "Shakespeare is called The .... of Avon" , "possibly mute" , "Graceful bird" .)