Related Clues:

• William Penn, for one
• Churchill, for one
• Arthur Conan Doyle title
• ''Hey, bud!''
• Cousin of 'ahem'
• Oft-heard boot camp word
• ''Hey, Mac!''
• Title of nobility
• What to call an officer
• Call for attention
• Gielgud's title
• Poitier role
• Head-turner
• Sibilant exclamation
• What Jeeves calls Wooster