Crossword Genius

Colour of the rainbow (6)

Ross

I believe the answer is:

indigo

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

This is the entire clue.

(Other definitions for indigo that I've seen before include "type of dye" , "One of the colours of the rainbow" , "Deep-blue dye or colour" , "Mood - (Duke Ellington)" , "Spectral colour" .)

I've seen this clue in The Times and The Guardian.
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