Related Clues:

• Fi preceder
• Work under cover
• Be a voyeur, perhaps
• Look through a peephole, perhaps
• "I ___" (early Cosby show)
• World traveler, perhaps
• Phys. or biol.
• Intel collector
• Concern yourself with intelligence
• "The ___ Who Loved Me"
• Code user
• Biol. or zool.
• HS department
• Secret stealer
• Le Carré hero, e.g.