Related Clues:

• Title for Mick Jagger
• [Nudge]
• U2's Bono, since 2007
• Dear __ or Madam
• Stevie Wonder's '___ Duke'
• Audible nudge
• Subtler alternative to "Yo!"
• Word said with a salute, sometimes
• Honorific for McCartney
• "Do you want to hear a secret?"
• Ma'am's counterpart
• Utterance before passing a note, maybe
• "To __, With Love"
• Covert attention-getter
• "To ___, With Love"