Related Clues:

• Stratego piece (3)
• Bond, e.g
• :-) , for one
• Washington D.C.'s International ___ Museum
• Government agent
• Watch furtively
• Mole, for example
• Mole, perhaps
• Cover girl, e.g.?
• Ingrid in "Notorious," e.g.
• Unwelcome plant
• One undercover
• With 5-Down, snooping aid
• Thriller hero, often
• 'Alias' type