Get rid of stunted vegetation (5)
I believe the answer is:
scrub
I believe this is a double definition.
'get rid of' is the first definition.
(scrub can mean to cancel or erase)
'stunted vegetation' is the second definition.
(undergrowth or stunted forest growth)
(Other definitions for scrub that I've seen before include "Vegetation consisting of stunted trees or bushes" , "Discontinue" , "Cancel; clean vigorously" , "Clean thoroughly - cancel" , "Powerful wash" .)