Seat launched, did you say? (6)
I believe the answer is:
throne
'seat' is the definition.
(throne is a kind of seat)
'launched did you say?' is the wordplay.
'launched' becomes 'thrown' (launch can mean to throw or chuck).
'did you say?' indicates a 'sounds like' (homophone) clue.
'thrown' is a homophone of 'THRONE'.
(Other definitions for throne that I've seen before include "A king or queen sits on it" , "Sovereign's seat" , "Regal seat" , "Monarch's seat" , "Seat of a ruler" .)