Possible Clues:

• Roll an inopportune seven, with 'out'
• Roll an unlucky seven, with "out"
• Groan-inducing dice roll
• 'Oh, no!'
• Losing roll at a casino
• Bad throw at a casino
• See 6 Across
• Losing roll at dice
• Roll an ill-timed seven, with 'out'
• Bad dice throw