Crossword Genius

Dull American wind (6)

Ross

I believe the answer is:

flatus

'wind' is the definition.
('flatus' can be a synonym of 'wind')

'dull american' is the wordplay.
'dull' becomes 'flat' ('flat' can be a synonym of 'dull').
'american' becomes 'us'.
'flat'+'us'='FLATUS'

(Other definitions for flatus that I've seen before include "wind" , "gas" .)

I've seen this clue in The Telegraph.
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