Related Clues:

• Little brother, to an older sibling, say
• Pantry ant, e.g
• Constant nuisance
• Recurring pain?
• Slug, e.g
• Insecticide victim
• Mosquito or gnat
• Irking insect
• One with a muzzle, maybe
• Mole, to a suburbanite
• Mosquito on the attack
• Annoying person or bug
• Irritating one
• Steady annoyance
• Nasty pooch, maybe