Boundary of bushes (5)
I believe the answer is:
hedge
'boundary of bushes' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for hedge that I've seen before include "Shrubby boundary" , "Fence of bushes or small trees" , "Row of linked shrubs" , "Qualify by conditions; boundary of bushes" , "Put off growing" .)