Fragrant bush (5)
I believe the answer is:
lilac
'fragrant bush' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lilac that I've seen before include "Shade" , "Shrub or small tree with fragrant blossom" , "Lavender colour" , "Light purple - flowering tree" , "Shrub with fragrant purplish or white flowers" .)