Related Clues:

• One in a million
• Eccentricity
• It's taken into account
• Peculiarity
• One for the books
• Three-legged calf, for one
• Rare find
• Attentiveness
• Quirkiness
• Return
• One for the record books
• Exceptional person
• Exception to the rule
• Hole in one, e.g.
• Curious thing