Long-billed wading bird (4)
'long-billed wading bird' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ibis that I've seen before include "Near-colourless mineral" , "I'm faced with big bill" , "Wading bird of warm regions" , "may be sacred?" , "sacred creature of Egypt" .)
(Other definitions for curlew that I've seen before include "Wading bird with fluting call" , "Curve-beaked bird" , "Flyer" , "Shorebird with long down-curved bills" , "Wading bird with long down-curved beak" .)