Crossword Genius

In jail, guard picked up something to eat (4)

Ross

I believe the answer is:

ugli

'something to eat' is the definition.
(ugli is a kind of food)

'in jail guard picked up' is the wordplay.
'in' indicates a hidden word.
'picked up' is a reversal indicator.
'ilgu' is hidden in the letters of 'jail guard'.
'ilgu' backwards is 'UGLI'.

(Other definitions for ugli that I've seen before include "Hybrid fruit, sounds nasty" , "Sweet variety of tangelo from Jamaica" , "Tropical fruit" , "Citrus fruit cross (which sounds offensive!)" , "Grapefruit/tangerine hybrid" .)

I've seen this clue in The Telegraph.
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