Possible Clues:

• Flush beater
• Setting for three kings, perhaps
• One may include three kings
• Good poker hand
• 'No seats left for the show in poker (4,5)'
• With all the seats taken in The D?il, it gives one the upper hand perhaps
• It's on the cards that one might hold three, all the same, and another pair
• Performance in which every seat is taken
• Great deal?
• All the seats are taken in hand for poker