Crossword Genius

Had breakfast - would be defeated after slice of bacon (5)

Ross

I believe the answer is:

eaten

'had breakfast' is the definition.

I don't understand how the rest of the clue works.

(Other definitions for eaten that I've seen before include "Put away" , "Devoured" , "Scoffed" , "corroded" , "demolished, possibly" .)

I've seen this clue in The Independent.
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