Related Clues:

• Pain of a sort
• Pain in the rear
• Mixed-up PETS?
• Tiny biter
• Small, biting fly
• Small biting fly
• Orkin victim
• Kibitzer, e.g.
• Gnat, for one
• Biting pest
• Kid brother, stereotypically
• Pesky bug
• Biblical plague insect
• Midge cousin
• Unwelcome greenhouse guest