Bird with a long curved bill (6)
I believe the answer is:
curlew
'bird with a long curved bill' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for curlew that I've seen before include "Wading bird with long down-curved beak" , "Wading bird with long slender curved bill" , "Large shorebird" , "Flyer" , "Wader with downcurved bill" .)