Related Clues:

• Difficult youngster
• Aphid, to a fruit tree
• Dennis the Menace, to Mr. Wilson
• Mini-demon
• Little mischief maker
• Playground problem
• Quite a handful
• Mosquito or mole, e.g.
• Fly, perhaps
• 17-Across in the neck
• Sitter's nightmare
• Picayune prankster
• Annoying bug
• Little monster
• Roguish sort