Crossword Genius

London prison almost clean (5)

Ross

I believe the answer is:

scrub

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'clean' is the definition.
(scrub can mean to clean)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for scrub that I've seen before include "Cancel (colloq)" , "Drop" , "Take out - clean" , "Clean, low vegetation" , "Rough country area" .)

I've seen this clue in The Independent and The Times.
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