Possible Clues:

• Not a subject that's rewarding for a writer
• Could be Queen's payment for performance
• Kingliness
• Fidelity with new beginning for Harry and Meghan?
• Ready for performance for the Queen?
• Queen's family
• It's rewarding for author such as James, Henry or Lear, Edward
• It isn't common as reward for writer
• Monarchs and their families
• Payment made to a copyright holder for its use