Pale mauve (5)
I believe the answer is:
lilac
'pale mauve' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for lilac that I've seen before include "Shrub (but not always this colour)" , "Purplish in colour" , "Lavender colour" , "Light-purple" , "Light purple - shrub" .)