Possible Clues:

• 'Uncle,' in poker
• 'That's it for me'
• Poker player's concession, and what 18-, 20-, 37-, 56-, and 59-Across might say?
• Statement at the poker table
• "This just isn't my hand"
• "You win this hand"
• 'That bet is too high for me to call'
• 'This poker hand's no good!'
• “Too rich for me”
• Follower of “This isn’t a hand, it’s a foot!”