American broadcast flipping song (4)
I believe the answer is:
aria
'song' is the definition.
(aria is a kind of song)
'american broadcast flipping' is the wordplay.
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'broadcast' becomes 'air' ('air' can be a synonym of 'broadcast').
'flipping' says the letters should be written in reverse.
'air' in reverse letter order is 'ria'.
'a'+'ria'='ARIA'
(Other definitions for aria that I've seen before include "Operatic vocal" , "Repeated strain" , "Elaborate accompanied song for solo voice" , "complex song" , "Piece of music" .)