Colouring (7)

I think it could be either:

Which length description are you looking for?:

pigment

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

This is the entire clue.

(Other definitions for pigment that I've seen before include "Colouring substance" , "Colourful substance" , "Colouring material" , "Substance giving colour" , "Colouring matter" .)

I've seen this clue in the Evening Standard and The Guardian.

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