Mauve kin (5)
I believe the answer is:
lilac
'mauve kin' 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 "Light purple - shrub" , "Shade" , "Shrub or small tree with fragrant blossom" , "Flower celebrated by Schubert" , "Drop by about one, turning" .)