Related Clues:

• Perplexing puzzle
• Retort to 'No, you're not!'
• Real puzzle
• Problem of knotted ropes
• Question; one trying to impress
• Strong confirmation
• Difficult question for model
• Possible response to 'No, you're not'
• Defiant assertion
• Personal affirmation
• Rebuttal to 'You never . . .'
• "No, you're not!" retort
• One sits with problem
• Ungenuine person
• Curtail break and work to go over puzzle