Crossword Genius

In husband’s absence, warm through and polish off (3,2)

Ross

I believe the answer is:

eat up

'polish off' is the definition.
(polish off can mean to eat)

I can't explain the rest of the clue.

(Other definitions for eat up that I've seen before include "Devour entirely" , "Empty plate" , "show good appetite" , "Finish one's food" , "43 [TUCK] in" .)

I've seen this clue in The Times.
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