Related Clues:

• Fly, e.g.
• Annoying person
• Little brother, often
• Royal pain
• Irritant
• Unwanted visitor
• Ant, maybe
• Exterminator's target, perhaps
• Kitchen pest
• Dennis the Menace, for one
• Hanger-on
• Freshwater fish
• Unwelcome guest
• Bothersome person
• Adamant ant?