Related Clues:

• Sight
• Kind of glass
• Austin Powers, e.g
• Cloak-and-dagger type
• Wire wearer
• Hale, for one
• Mole, e.g
• ''I ___'' (classic TV show)
• Mole, e.g.
• Engage in espionage
• Cloak-and-dagger sort
• 007, e.g.
• Keep tabs (on)
• CIA worker
• Observe furtively