Crossword Genius

Clean up rough country (5)

Ross

I believe the answer is:

scrub

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'clean up' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for scrub that I've seen before include "Brush dirt off - delete - stunted vegetation" , "stunted trees and brushwood" , "Powerful wash" , "Get rid of" , "Abandon" .)

I've seen this clue in The Irish Independent.
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