Related Clues:

• Frank, Henry and Oscar from 23 down
• "Seriously?"
• "Good point!"
• A false alternative?
• 'T,' on a test
• Unlike fake news
• Facetious suffix with senior
• Time to regret being straight
• Genuine cessation of hostilities about to emerge
• 'How sweet __!'
• "Can't deny that"
• Unlikely to 15-Across
• Sinus suffix
• Curt affirmation
• Genuine; real