Bird with long down-curved bill (6)
I believe the answer is:
curlew
'bird with long down-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 slender curved bill" , "Wader with curved bill" , "Large shorebird" , "Wader with downcurved bill" , "Curve-beaked bird" .)