Pale purple flower (5)
I believe the answer is:
lilac
'pale purple flower' 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 "Shrub or small tree with fragrant blossom" , "Spiritual knowledge" , "Light purple - flowering tree" , "Tree - pinkish-purple colour" , "Flowering tree of the olive family" .)