Clean up the bush (5)
I believe the answer is:
scrub
I believe this clue is a double definition.
'clean up' is the first definition.
(I've seen this before)
'bush' is the second definition.
(I know that bush can be written as scrub)
'the' is the link.
(Other definitions for scrub that I've seen before include "clean-up" , "Undergrowth" , "Brush dirt off - delete - stunted vegetation" , "Eradicate" , "Brush, in two senses" .)