Possible Clues:

• Do one’s part?
• Take part in a D&D campaign, e.g
• Way of training students variously in production of opera taking year
• Act with old student in show again
• Be someone you're not
• Form of acting, extremely original in show once more
• Loyal rep excited to take part in training
• Acting out situations in rep – loyal characters changing places
• Do some therapeutic pretending
• Not be oneself, but rather be one's elf?