Crossword Genius

Potentially explosive talk? (3)

Ross

I believe the answer is:

gas

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

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for gas that I've seen before include "Hydrogen, for example" , "Wind" , "Fumes, vapour" , "Something exciting" , "Nitrogen maybe" .)

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