Abandon in brushwood (5)
I believe the answer is:
scrub
I believe this is a double definition.
'abandon' is the first definition.
(scrub can mean to remove or delete)
'brushwood' is the second definition.
(both can mean vegetation)
'in' acts as a link.
(Other definitions for scrub that I've seen before include "Eliminate" , "Scour; cancel" , "Cancel; clean vigorously" , "Scour; brushwood" , "Axe" .)