Related Clues:

• Plenty
• Emphatic affirmative
• Enthusiastic response
• 'Enough already!'
• 'Stop!'
• 'You can say that again!'
• 'Cease and desist!'
• 'Cut that out!'
• 'This isn't worth arguing about!'
• 'Can it!'
• 'That's enough!'
• 'Stop it!'
• 'But of course!'
• Middle of the quip, with 37-Across
• Enthusiastic approval