Garden shrub (6)
I believe the answer is:
azalea
'garden shrub' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for azalea that I've seen before include "Ornamental lime-hating shrub" , "Type of rhododendron" , "Garden plant related to rhododendrons" , "flower" , "Rhododendron-like shrub" .)