Hard-skinned fruit (5)
I believe the answer is:
gourd
'hard-skinned fruit' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for gourd that I've seen before include "Bottle-shaped fruit" , "Pumpkin, e.g" , "Fleshy fruit" , "Squash, for example" , "Hard-skinned fruit" .)