Possible Clues:

• Domed ceiling
• Prize, a look back at the dome
• Round domed roof
• Dome of copper mainly from the ends of the earth
• Do me up in the coal?
• Mug Oscar in American city with armoured revolving gun turret
• St. Peter's topper
• Mount Vernon feature
• Following aborted coup the French created crowning glory of the Pantheon
• Rounded dome forming a roof or ceiling