Crossword Genius

They change colours (4)

Ross

I believe the answer is:

dyes

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'colours' is the definition.
(dyeing is a kind of colouring)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for dyes that I've seen before include "Colours (fabric)" , "Substances for staining or colouring" , "Stains" , "turns green, possibly" , "Colour" .)

I've seen this clue in The Globe and Mail.
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