Yellowish-green (5)
I believe the answer is:
olive
'yellowish-green' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for olive that I've seen before include "Mediterranean tree-fruit, nice in cocktail" , "Mediterranean fruit or greenish colour" , "Stoned fruit" , "Small green Mediterranean tree-fruit (5)" , "Cocktail fruit" .)