Possible Clues:

• Regal, majestic
• This blue is deep and vivid
• - blue; - assent
• "Your ___ highness"
• Not common
• Put up wager with gold sovereign
• Turn to produce an egg, or be more than 1 across
• Prince Charles, for one
• - Icing, - flush, - jelly
• August, where end of July a parting duty, virtually