Related Clues:

• Paul McCartney, for one
• Walter Scott's title
• 'Hey, mister!'
• Polite address
• 'My dear man'
• Madam's counterpart
• 'To ___ With Love'
• Army address
• Polite term of address
• Camelot honorific
• Dear one?
• Elton John's title
• See 61-Across
• William Penn, for one
• Churchill, for one