Major cure fee (anag) — act of God that prevents one keeping a promise (5,7)

I believe the answer is:

force majeure

(Other definitions for force majeure that I've seen before include "irresistible compulsion" , "Act of God preventing someone from fulfilling a contract" , "Uncontrollable course of events" , "Superior strength" , "Legal excuse" .)

I've seen this clue in The Guardian.

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