Indigo (4)

I think it could be either:

Which length description are you looking for?:

mood

'indigo' is the definition.
(anil is another word for indigo)

This is the entire clue.

(Other definitions for anil that I've seen before include "Shrub yielding indigo" , "Species of blue" , "Source of dye" , "A blue dye" , "Indian man" .)

I've seen this clue in The Times, the Penny Press and the Sydney Morning Herald.

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