Unseated from the said seat (6)
I believe the answer is:
Here is my best explanation:
'unseated' is the definition.
(I've seen this before)
'the said seat' is the subsidiary indication.
'the said' shows a homophone (sound like).
'seat' becomes 'throne' (throne is a kind of seat).
'throne' is a homophone of 'thrown'.
'from' is the link.
(Other definitions for thrown that I've seen before include "Flung", "Cast", "baffled", "Disconcerted; chucked", "Having been projected through the air", "Unsettled", "given up intentionally", "Rabindranath ---, Indian sage", "Confused; chucked" and "put out".)