Colourant (3)

I believe the answer is:

dye

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

This is the entire clue.

(Other definitions for dye that I've seen before include "Colour by dipping in liquid" , "Colorant" , "Tint" , "Colourant" , "Staining material" .)

I've seen this clue in The Telegraph, The Times, The Independent and the Canadiana.

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