Citrus fruit common in Jamaica (4)

I believe the answer is:

ugli

(Other definitions for ugli that I've seen before include "Citrus fruit cross (which sounds offensive!)" , "Cross between Seville orange, grapefruit and tangerine" , "Orange-grapefruit cross" , "Unappealing-sounding fruit?" , "Mottled tangelo hybrid" .)

I've seen this clue in The Guardian.

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