Related Clues:

• Paparazzo sort
• Peek in someone's medicine cabinet, perhaps
• Nose
• Listen in
• One who peeps, perhaps
• Pesky neighbor
• Poke (around)
• Prying sort
• Be too inquisitive
• Eavesdrop or eavesdropper
• Get your nose into someone's business
• Nosy type
• Nero Wolfe, for one
• Stick one's nose in
• Work as a shamus