Crossword Genius

One sustained by so much hot air? (7)

Ross

I believe the answer is:

balloon

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(Other definitions for balloon that I've seen before include "One blown up for party" , "Inflatable sphere, may contain hot air" , "Inflatable - rapidly expand" , "Inflate" , "Inflatable rubber bag, could be filled with hot air" .)

I've seen this clue in the Evening Standard.
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