Egret? (5)
I believe the answer is:
heron
'egret?' is the definition.
(egret is a kind of heron)
This is all the clue.
(Other definitions for heron that I've seen before include "flier" , "Long-legged long-necked wading bird" , "Graceful grey bird with long neck" , "Large British wading bird" , "Rhone (anag) - bird" .)