Related Clues:

• Exculpatory story
• A spy might work under one
• Cover story
• Stage name
• Impostor's cover
• Nom de guerre
• Literally, 'elsewhere'
• Suspect's out
• A thief may go under one
• Something to go under
• Fake handle?
• Name on a police blotter
• What a person may go under
• Assumed identity
• It may be airtight