Potentially explosive talk? (3)
I believe the answer is:
gas
'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" .)