Related Clues:

• I agree with you (sigh!)
• Informal agreement: you sound surprised
• On wrong path? No one following, it goes without saying
• Casual form of yes
• 'We did it!'
• Word repeated after "She loves you," in a '60s hit
• Energy in fodder? That's about agreed
• "Uh-huh!"
• Unpolished assent
• "For certain"
• It's to do with a series of lectures, naturally
• Doubtless pertaining to the turf
• It must be remembered from another source
• Positive response you offered with interjection
• Yes, it's 50:50 Kaye and Leah