Related Clues:

• Application request
• Elton John, e.g.
• Safe deposit box item, perhaps
• Elton John or Mick Jagger
• Lockbox document
• Knight, by definition
• 'Yes, ___!'
• Base address
• See 6-Down
• Round Table address
• 'Mister!'
• Closing document
• Peter, Paul or Mary
• Word said with a salute
• Title for 17-Across