Teacher's pest

IMP

Think of a tiny troublemaker that might sit on your shoulder in folklore.

The clue "Teacher's pest" hints at a small, annoying creature that might bother someone in charge—like a teacher. "Imp" fits because it’s a mischievous little demon or troublemaker, often used playfully for someone who causes minor chaos. The word also works as a pun since "imp" sounds like a shortened, informal way to say "impudent" (rude or bold), which could describe a disruptive student. It’s a clever double meaning packed into a short answer.