Related Clues:

• One-third of a Beatles refrain
• 'Is that so?'
• 'You got it'
• Nullified tennis serves
• '___ not fight'
• Doubtless
• Reasons for do-overs
• "Why don't we?"
• 'No prob'
• Gives the go-ahead
• Repeated services
• "Without a doubt!"
• "Why not?"
• Response to "Shall we?"
• "Absolutely!"