Crossword Genius

Rainbow colour (6)

Ross

I think it could be either:

indigo

violet

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

This is all the clue.

(Other definitions for indigo that I've seen before include "product of woad" , "Ellington's Mood" , "Dark blue dye (plant)" , "Blue-violet colour" , "Violet dye" .)

I've seen this clue in The Times, the Evening Standard and The Mirror.
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