Crossword Genius

Colouring agent (3)

Ross

I think it could be either:

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3

7

'colouring agent' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for dye that I've seen before include "Pigment" , "Colouring; sounds like fade" , "Colourant" , "Colouring liquid" , "Staining material" .)

I've seen this clue in The Times, The Sunday Times and The Telegraph.
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