Crossword Genius

Firework ingredient (9)

Ross

I believe the answer is:

gunpowder

(Other definitions for gunpowder that I've seen before include "It's used in gunnery and fireworks" , "Explosive mixture (of tea?)" , "Explosive; type of 23 dn" , "Oldest known explosive" , "Ingredient of fireworks" .)

I've seen this clue in the Evening Standard.
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