Wrinkly citrus fruit (4)
I believe the answer is:
ugli
'wrinkly citrus 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 "Large juicy fruit with thick wrinkled skin" , "Unappealing-sounding fruit?" , "Sweet variety of tangelo from Jamaica" , "Tropical fruit" , "Citrus fruit of the West Indies" .)