Related Clues:

• Elton John, e.g.
• Elton John or Mick Jagger
• Knight, by definition
• 'Yes, ___!'
• Base address
• Round Table address
• 'Mister!'
• Word said with a salute
• Title for 17-Across
• Londoner, e.g.
• Londoner
• Respectful title
• What to call a sergeant
• Yank ally
• Walter Raleigh, for one