Citrus variety (4)
I believe the answer is:
ugli
'citrus variety' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ugli that I've seen before include "Mottled tangelo hybrid" , "Sweet variety of tangelo from Jamaica" , "(Repulsive-looking?) fruit" , "Jamaican form of 6" , "West Indian citrus fruit" .)