Related Clues:
- Work undercover
- One of two regular Mad magazine opponents
- Mata Hari, notably
- He came in from the cold
- Bug someone's phone, e.g.
- ___ ring
- Le Carré character
- Covert agent
- Plant of a sort
- Be a mole
- Maxwell Smart, e.g.
- Watch through binoculars, say
- Stratego piece (3)
- Bond, e.g
- Washington D.C.'s International ___ Museum