Fruit named for its unattractiveness (4)

I believe the answer is:

ugli

(Other definitions for ugli that I've seen before include "Jamaican form of 6" , "Hybrid fruit, sounds nasty" , "Tangerine-grapefruit hybrid" , "Cross between Seville orange, grapefruit and tangerine" , "Trademark name for a hybrid citrus fruit" .)

I've seen this clue in the Universal.

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