Crossword Genius

Cleans up at games of chance (6)

Ross

I believe the answer is:

sweeps

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'cleans up' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

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(Other definitions for sweeps that I've seen before include "Cleans with a broom" , "Clean with a broom" , "Moves in an arc" , "Cleans the floor with a brush" , "Old blackguards" .)

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