Related Clues:
- Writer in cipher, maybe
- Foe of 1-Across in Mad magazine
- Leader of a double life
- James Bond, e.g
- Try to improve one's intelligence illegally, perhaps
- Prohias protagonist
- Secretly watch, with "on"
- Alias user
- Caleb, for one
- Peek through a keyhole
- Mad antagonist
- "Tinker, Tailor, Soldier, ___"
- Watch from hiding
- Intelligence seeker
- A couple of pounds for the lot