Dense group of bushes (7)
I believe the answer is:
thicket
'dense group of bushes' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for thicket that I've seen before include "A patch of shrubs and small trees" , "Mass of shrubs and bushes growing close together" , "Dense growth of bushes" , "Coppice" , "Dense mass of trees or shrubs" .)