Large juicy fruit, hybrid between a tangerine and a grapefruit (4)

I believe the answer is:

ugli

(Other definitions for ugli that I've seen before include "Large juicy fruit with thick wrinkled skin" , "Hybrid fruit, sounds nasty" , "Grapefruit/tangerine hybrid" , "Black/violet element" , "Orange-grapefruit cross" .)

I've seen this clue in The Guardian.

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