Crossword Genius

Component of fertilisers and explosives, also known as potassium nitrate (9)

Ross

I believe the answer is:

saltpetre

(Other definitions for saltpetre that I've seen before include "Component of gunpowder" , "chemical" , "explosive component" , "Potassium nitrate" , "Nitre" .)

I've seen this clue in The Independent.
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