Possible Clues:

• What happens on the stage is a performance in psychology
• Do some acting, using old line in show again
• Take part in cup-tie, securing goal at intervals
• Acting with bold heart in attempt to resolve 7
• Act out a character
• Act the part, including old line in show again
• Be a wizard or an elf, say, in Dungeons & Dragons
• Act a part, and run round back of hall to record song
• It's assumed it teaches by experience
• Undergo training, perhaps