Crossword Genius

Vacuous chatter (3,3)

Ross

I believe the answer is:

hot air

(Other definitions for hot air that I've seen before include "Loud and empty talk to lift a balloon?" , "Empty or boastful talk - good for balloons" , "Bombast or balloon filler" , "over the Sahara?" , "Bull" .)

I've seen this clue in The Times.
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