Crossword Genius

Skittle's color source (3)

Ross

I believe the answer is:

dye

(Other definitions for dye that I've seen before include "Colouring agent" , "Colouring matter" , "Colouring; sounds like fade" , "Soluble substance for staining or colouring" , "Liquid used to change colour of clothes" .)

I've seen this clue in the Universal.
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