Possible Clues:

• Poker player's dream ... and a hint to the ends of 17-, 25-, 35- and 50-Across
• Kingly fellow with excellent hand
• Hand that's sort of blue gets to turn red
• It could include Red Queen
• Chance to have a heart to heart?
• Two men get drunk in sequence
• A good hand for a prince say, that's rich!
• Action taken by queen vacating throne that's on the cards
• Great hand making monarch look embarrassed?
• Sign of top family's embarrassment, getting such a good hand