Possible Clues:

• Performed play, in charge like a teacher
• Instructive, perhaps patronisingly
• Played a role with one at front of class giving lesson
• Accomplished performance by one college plans to teach another a lesson
• Was a thespian in charge of teaching
• Performed first part of play cold? That's edifying
• Instructive and accomplished performance in charge
• Preachy
• Like a teacher
• Performed deed in college, initially providing instruction