Related Clues:

• Bahrain, Bhutan or Brunei
• Kingship system
• Rule by a sovereign
• Wealth denied English with introduction of cunning kind of government
• Butterfly with its tail at the end, as a rule
• As a rule, it's what we're used to
• British people, but not Americans, have it, as a rule
• As a rule, it has involved harmony around head of Commonwealth
• Cash point replaced by chief — it requires a sovereign
• Expression of surprise about one endlessly cunning sort of government
• Unusual harmony about the start of Christmas in the kingdom
• Day at start of cunning year's rule in UK
• Anchor at sea in my domain
• Protest about running Hillary, ultimately? Republicans oppose it
• Saudi Arabia, for one