Light purple colour (5)
I believe the answer is:
lilac
'light purple colour' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for lilac that I've seen before include "Fragrant, pale purple flower" , "Tree with pink blossoms" , "Plant" , "Pinkish purple - shrub" , "Shrub with fragrant purplish or white flowers" .)