Fruit for bird (4)
I believe the answer is:
kiwi
This clue is a double definition.
'fruit' is the first definition.
(I know that kiwi is a fruit)
'bird' is the second definition.
(I know that kiwi is a type of flightless bird)
'for' is the link.
(Other definitions for kiwi that I've seen before include "Rutherford was one" , "Someone from Auckland?" , "Enzedder; flightless bird" , "Someone from New Zealand?" , "Fruit and flightless bird" .)