Crossword Genius

Revolted, had left one's seat (5)

Ross

I think it could be either:

risen

arose
I'm a little stuck... Click here to teach me more about this clue!

'revolted' is the definition.
(I've seen this before)

'left one's seat' is the wordplay.
I cannot really understand how this works, but
'one's' could be 'is' (Roman numeral) and 'is' is present in the answer.
The remaining letters 'ren' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'had' acts as a link.

Can you help me to learn more?

(Other definitions for risen that I've seen before include "mounted a rebellion" , "Grown up" , "(Having) come up" , "Moved up" , "Sprung up" .)

I've seen this clue in the Evening Standard.
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