Egret relative (5)
I believe the answer is:
heron
'egret relative' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for heron that I've seen before include "Graceful grey bird with long neck" , "Big bird" , "Large British wading bird" , "Large fish-eating bird" , "Tall wading bird" .)