Oil-yielding fruit (5)
I believe the answer is:
olive
'oil-yielding fruit' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for olive that I've seen before include "Greyish-green; fruit" , "Stoned fruit" , "Female" , "Mediterranean tree-fruit - nice in martini" , "A Med. fruit-tree" .)