Bushes (6)
I believe the answer is:
shrubs
'bushes' is the definition.
('shrub' can be a synonym of 'bush')
This is the entire clue.
(Other definitions for shrubs that I've seen before include "Low, woody bushes" , "'Woody plants, bushes (6)'" , "Low-growing woody plants" , "Low, woody, perennial plants" , "Small woody plants and bushes" .)