Milli Vanilli lacking some colour? (5)
I believe the answer is:
lilac
'colour?' is the definition.
(I know that lilac is a color)
'milli vanilli lacking some' is the wordplay.
'some' says the answer is hidden in the clue.
'LILAC' is hidden within 'milli vanilli lacking'.
(Other definitions for lilac that I've seen before include "Lavender colour" , "Shade" , "Shrub or small tree with fragrant blossom" , "Mauve-like colour" , "Shrub with fragrant purplish or white flowers" .)