Clean up rough country (5)
I believe the answer is:
scrub
'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" .)