Related Clues:

• Smith, perhaps
• Otherwise known as
• Some cons assume it
• Con's cover
• Son of Sam, e.g.
• A criminal may go by it
• False name
• A spy might work under one
• Stage name
• Impostor's cover
• Nom de guerre
• A thief may go under one
• Something to go under
• Fake handle?
• Name on a police blotter