Mark with multicolored spots (6)
I believe the answer is:
mottle
'mark with multicolored spots' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mottle that I've seen before include "Colour with blotches of different shades" , "Variegated pattern" , "Colour blotchily" , "Mark with patches of colour" , "Irregular arrangement of patches of colour" .)