Possible Clues:

• Rules over, occupies throne
• Wayne's ____ (Gretzky's dominance)
• Obtains 20s broadcast
• Holds the title of monarch
• 1910-36 for George V, and 1936-52 for George VI
• Holds sway
• Obtains what may lead horses to drink gallons
• Sounds not so fine as a rule
• As a rule this sounds wet for the rider
• It's not so fine, by the sound of it, when one is on a throne