Related Clues:

• Mosquito, e.g.
• Unwelcome visitor
• Exterminator's quarry
• Constant interrupter
• Persistent annoyer
• Bothersome one
• Bothersome type
• Genuine nuisance
• Telemarketer, perhaps
• Brat or bug, e.g.
• Gnat or brat
• Mole, to a gardener
• Raid victim
• Pain, so to speak
• Pain in the you-know-what, e.g.