Related Clues:

• "Amen!"
• Affirming word
• One of two definitive responses
• "Sure!"
• Happy cry
• Undoubtedly
• ''Be happy to!''
• Victorious shout
• It's ''positively'' hidden four times in this puzzle
• ''Sure thing!''
• "Sure"
• 'Definitely!'
• ''All right''
• Opposite of 21-Across
• Certain definitive response