Leguminous West Indian shrub; a source of indigo (4)

I believe the answer is:

anil

(Other definitions for anil that I've seen before include "It produces dye" , "Source of dye" , "Indigo (plant or dye)" , "West Indian shrub, source of indigo" , "Dye for nail" .)

I've seen this clue in The Mirror.

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