Broke wind by military bigwig (7)
I believe the answer is:
boracic
'broke' is the definition.
(I've seen this before)
'wind by military bigwig' is the wordplay.
'wind' becomes 'bora' (I've seen this before).
'by' means one lot of letters go next to another.
'military bigwig' becomes 'CIC' (abbreviation for commander in chief).
'bora'+'cic'='BORACIC'
(Other definitions for boracic that I've seen before include "Acid used as a mild antiseptic" , "Broke" , "Poor Cockney" .)