Graceful waterbird (4)
I believe the answer is:
swan
'graceful waterbird' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for swan that I've seen before include "Sweet name 8 [OF SHAKESPEARE]" , "... Australian river" , "Long-necked water bird" , "Flighty" , "Kind of song, in the end" .)