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Change of government has to depose king, in theory (9)

Ross

I believe the answer is:

evolution

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'theory' is the definition.
(I have seen 'Darwinian theory ' mean 'evolution' so perhaps 'theory' could also mean 'evolution')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for evolution that I've seen before include "it's a gradual process" , "Darwinian theory" , "Darwin's theory" , "Gradual development" , "Gradual change" .)

I've seen this clue in The Guardian.
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