Bombastic talk (3)
'bombastic talk' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hot air that I've seen before include "Loud and empty talk to lift a balloon?" , "Boastful talk or balloon filling" , "Empty bombast often found in balloon" , "Empty or boastful talk - good for balloons" , "is essential before the balloon goes up" .)
'bombastic talk' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for gas that I've seen before include "natural resource" , "Neon, for example" , "Form of fossil fuel" , "may fill American car" , "chew the fat" .)