How kitchenhand hit the jackpot? (7,2)

I believe the answer is:

cleaned up

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I'm afraid I can't explain this answer.

(Other definitions for cleaned up that I've seen before include "Expurgated" , "what the charlady did" , "Put in order - gained financially" , "'Hit the Jackpot'" , "Made a substantial profit" .)

I've seen this clue in the Sydney Morning Herald.

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