Colour used finally in my opening statement? (6)

I believe the answer is:

indigo

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'colour' is the definition.
(indigo is a kind of colour)

I don't understand the remainder of the clue.

(Other definitions for indigo that I've seen before include "Blue/violet dye" , "Natural blue dye" , "type of dye" , "product of woad" , "Violet-blue dye" .)

I've seen this clue in The Guardian.

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