Wader twice spotted near island (4)
I believe the answer is:
ibis
'wader' is the definition.
(ibis is a kind of wader)
'twice spotted near island' is the wordplay.
'twice' becomes 'bis' (I've seen this in other clues).
'spotted near' says to put letters next to each other (I've seen this in other clues).
'island' becomes 'i'.
'bis' after 'i' is 'IBIS'.
(Other definitions for ibis that I've seen before include "Wader worshipped by ancient Egyptians" , "Wader with a long down-curved bill" , "Type of bird" , "Bird sacred in Ancient Egypt" , "sacred creature of Egypt" .)