Dark green pear-shaped fruit (7)
I believe the answer is:
avocado
'dark green pear-shaped fruit' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for avocado that I've seen before include "Fruity colour" , "A fruit; a dull green" , "Tropical tree - edible green-skinned fruit" , "Large-stoned pear-shaped fruit" , "Pear-shaped tropical fruit" .)