Hybrid of a grapefruit, Seville orange and tangerine (4)

I believe the answer is:

ugli

(Other definitions for ugli that I've seen before include "Grapefruit/tangerine hybrid" , "Unattractive-sounding fruit?" , "Jamaican form of 6" , "West Indian citrus fruit" , "Mottled tangelo hybrid" .)

I've seen this clue in The Times.

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