Crossword Genius

Plant-based hair dye (5)

Ross

I believe the answer is:

henna

(Other definitions for henna that I've seen before include "Dye used in skin decoration" , "Local colour" , "shock treatment" , "Reddish brown dye used on hair" , "Reddish-brown plant dye" .)

I've seen this clue in The Guardian.
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