Crossword Genius

Intermixed explosive? (5)

Ross

I believe the answer is:

nitre

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'explosive?' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for nitre that I've seen before include "what goes into bangers" , "Salt" , "Gunpowder ingredient" , "Also known as salt-petre" , "Inter (anag.)" .)

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