Related Clues:

• Yapping dog, e.g.
• D-Con target
• Bug bomb target
• Buttinsky, e.g.
• Spammer, for one
• Mosquito, e.g.
• Unwelcome visitor
• Exterminator's quarry
• Constant interrupter
• Persistent annoyer
• Bothersome type
• Genuine nuisance
• Telemarketer, perhaps
• Brat or bug, e.g.
• Gnat or brat