Possible Clues:

• Start of a postwar period
• Peace talks goal
• What a white flag signifies
• Conservative breaks genuine conciliatory agreement
• Armistice or cease-fire
• After short setback, finally endorse ceasefire
• Sounds like a piece of a cruet
• Cruet (anag.)
• Short uprising followed by ultimately fragile ceasefire
• Genuine ceasefire originally included in this?