Related Clues:

• Hoped-for reply
• 'Of course!'
• 'I agree!'
• 'I'll second that'
• 'Aye, aye!'
• Final word of 'Ulysses'
• Direct mail sticker
• OK
• 'Let's do it!'
• Encouraging word
• 'Right'
• 'Undeniably'
• Thumbs-up response
• 'Amen!'
• Invitation inits.