Related Clues:

• Put a curb round gelding's head and get control
• Sound of waterfall as a rule ...
• Rule of restraint without force
• Be king of Niger?
• Sit on the throne, which is wet by the sound of it!
• Check the key in, as a rule
• Rule to ignore, bent - nothing's lost
• Sway one to enter, say, into the navy
• Prevail in pronounced bad weather
• Rule about unknown
• Check statement as a rule
• Check broadcast as rulers do
• Give up when squadron leader's going to prevail
• Pronouced fall, as a rule
• Right to be king and regularly exercise power