Wacky winger (6)
I believe the answer is:
cuckoo
I believe this clue is a double definition.
'wacky' is the first definition.
(thesaurus)
'winger' is the second definition.
(cuckoo is a kind of bird)
(Other definitions for cuckoo that I've seen before include "Intruder bird in the nest" , "Bird; sort of clock" , "Bananas" , "slightly mad type" , "No home bird, this" .)