Related Clues:

• Agatha Christie title
• See 17-Across
• Title for Kiri Te Kanawa
• Edith Evans, for one
• British title
• Sir's partner
• Woman of distinction
• Lady's title
• Collar type
• Broad
• Sir's counterpart
• Knight's wife, in olden times
• Agatha Christie, e.g.
• Children's classic
• Female V.I.P.