Crossword Genius

Crimson food colouring (9)

Ross

I believe the answer is:

cochineal

(Other definitions for cochineal that I've seen before include "Scarlet food dye" , "Crimson dye from crushed insects" , "Scarlet dye - in a cloche (anag)" , "Red food colouring" , "Red colour" .)

I've seen this clue in the Sydney Morning Herald.
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