Clean up rough vegetation (5)
I believe the answer is:
scrub
I believe this is a double definition.
'clean up' is the first definition.
(I've seen this before)
'rough vegetation' is the second definition.
(Other definitions for scrub that I've seen before include "Cancel (colloq)" , "Eliminate" , "plants" , "Stunted growth" , "Clean by rubbing really hard" .)