Related Clues:

• Annoying person
• Little brother, often
• Royal pain
• Irritant
• Unfriendly pet, perhaps
• Unwanted visitor
• Ant, maybe
• Dog to beware of
• Dennis the Menace, for one
• Junkyard dog, most likely
• Hanger-on
• Ill-trained dog, perhaps
• Unwelcome guest
• Bothersome person
• Adamant ant?