Seat flung in the air, we hear (6)
I believe the answer is:
throne
'seat' is the definition.
(throne is a kind of seat)
'flung in the air we hear' is the wordplay.
'flung in the air' becomes 'thrown'.
'we hear' shows a homophone (sound like).
'thrown' is a homophone of 'THRONE'.
(Other definitions for throne that I've seen before include "heads" , "Seat of authority" , "Royal chair" , "Royalty sits on it" , "Monarch's seat" .)