Revolt due to pact being broken (4,5)

I believe the answer is:

coup detat

(Other definitions for coup detat that I've seen before include "Sudden, perhaps violent, overthrow of a government" , "leadership change" , "Acted up to create sudden overthrow of government" , "sudden takeover" , "Unconstitutional overthrow of a government" .)

I've seen this clue in The Times.

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