Crossword Genius

Grub for which Cockney uses microwave? (4)

Ross

I believe the answer is:

eats

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'grub' is the definition.
(synonyms)

I don't understand the remainder of the clue.

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(Other definitions for eats that I've seen before include "Consumes or dines" , "Commonly, they eliminate" , "Provisions" , "Is not any faster" , "Sate (anag.)" .)

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