Saltpetre (5)

I believe the answer is:

nitre

'saltpetre' is the definition.
(synonyms)

This is all the clue.

(Other definitions for nitre that I've seen before include "constituent of gunpowder" , "Also known as salt-petre" , "explosive producer?" , "Inert kind of saltpetre" , "Chemical" .)

I've seen this clue in the Sydney Morning Herald, The Telegraph, The Mirror, The Times, the Evening Standard and The Independent.

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