Crossword Genius

The buttocks let out hot air (7)

Ross

I believe the answer is:

prattle

'hot air' is the definition.
(thesaurus)

'the buttocks let out' is the wordplay.
'the buttocks' becomes 'prat' ('prat' can be a synonym of 'buttocks'**).
'out' indicates an anagram (out can mean wrong or inaccurate).
'let' is an anagram of 'tle'.
'prat'+'tle'='PRATTLE'

(Other definitions for prattle that I've seen before include "Talk emptily" , "Childish talk" , "Be vapidly garrulous" , "Talk inanely" , "Inconsequential chatter" .)

I've seen this clue in The Independent.
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