Indigo plant (4)

I believe the answer is:

anil

'indigo plant' is the definition.
(anil is a kind of indigo plant)

This is all the clue.

(Other definitions for anil that I've seen before include "Colouring" , "It produces dye" , "Shrub yielding indigo" , "name of man" , "Species of blue" .)

I've seen this clue in the LA Times and The New York Times.

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