Cast from the seat of power, we hear (6)
I believe the answer is:
thrown
'cast' is the definition.
(I've seen this before)
'the seat of power we hear' is the wordplay.
'the seat of power' becomes 'throne' (I've seen this before).
'we hear' shows a homophone (sound like).
'throne' sounds like 'THROWN'.
'from' acts as a link.
(Other definitions for thrown that I've seen before include "Unseated" , "Rabindranath ---, Indian sage" , "given up intentionally" , "Disconcerted; chucked" , "Unsettled" .)