Fruit also known as the Jamaican tangelo (4)

I believe the answer is:

ugli

(Other definitions for ugli that I've seen before include "Trademarked hybrid citrus fruit" , "Plain-sounding fruit" , "Grapefruit/tangerine hybrid" , "Hybrid fruit, sounds nasty" , "West Indian citrus fruit" .)

I've seen this clue in The Guardian.

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