Wrinkly fruit (4)
I believe the answer is:
ugli
'wrinkly fruit' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ugli that I've seen before include "Hybrid of tangerine and grapefruit" , "Mottled tangelo hybrid" , "Tangerine-grapefruit hybrid" , "Unappealing-sounding fruit?" , "Trademark name for a hybrid citrus fruit" .)