Related Clues:

• Stop on beat: and on criminal!
• Spy's name, perhaps
• Anonymity protector
• Really captivate
• Spy's alternate name
• Stop or check (motion)
• Keep from advancing
• Undercover’s cover
• Champion boxer with a second assumed name
• Nick a translation of Sartre
• Other handle a skipper pulled back
• Bloomer and Earhart, for two
• George Orwell or George Eliot, e.g
• What typically follows a.k.a
• Spy's fake identity