Crossword Genius

Clean room to keep you sharp across finals (3,2)

Ross

I believe the answer is:

mop up

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'clean' is the definition.
(to mop something up is to clean it)

I can't explain the rest of the clue.

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(Other definitions for mop up that I've seen before include "Kill (enemy stragglers)" , "Complete final stage (of a task)" , "polish off" , "take care of" , "Clear away, dispose of" .)

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