Related Clues:

• Undercover worker
• James Bond, e.g.
• Operative
• Secretly watch
• Smart or Smiley
• Secretive org.
• Eavesdropper
• Fact-gathering grp.
• Feudal lord
• Eavesdrop
• Peek in (on)
• Notice
• 'Harlot's Ghost' subj.
• ___-fi
• Iran-contra org.