Crossword Genius

With sulphur and charcoal, can be explosive! (5)

Ross

I believe the answer is:

nitre

I'm a little stuck... Click here to teach me more about this clue!

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

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for nitre that I've seen before include "what goes into bangers" , "explosive component" , "Chemical" , "explosive ingredient" , "Mineral used in gunpowder" .)

I've seen this clue in the Evening Standard.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.