Do away with rough vegetation (5)
I believe the answer is:
scrub
I believe this is a double definition.
'do away with' is the first definition.
(thesaurus)
'rough vegetation' is the second definition.
(Other definitions for scrub that I've seen before include "Clean by rubbing really hard" , "Clean thoroughly - cancel" , "Cancel (colloq)" , "Wash vigorously" , "Rub hard - low vegetation" .)