Related Clues:

• Washington D.C.'s International ___ Museum
• Government agent
• Watch furtively
• Mole, for example
• Shifty sort
• Choice for third and short
• Dastard
• Mole, perhaps
• Cover girl, e.g.?
• Act furtively
• Ingrid in "Notorious," e.g.
• Unwelcome plant
• One undercover
• Avoid detection
• With 5-Down, snooping aid