Blue dye (6)

I think it could be either:

Which length description are you looking for?:

indigo

'blue dye' 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" , "Deep dark blue" , "Ellington's Mood" , "I of ROYGBIV" , "Deep-blue dye or colour" .)

I've seen this clue in The Independent, The Guardian, the Evening Standard, The Times and The Telegraph.

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