Possible Clues:

• Actor is subject to scrutiny
• Subject to schoolwork, he may get the chance to go on
• Actor who learns the part of another actor in order to act as a replacement if necessary
• Don�t learn enough, showing reserve
• The second Hamlet is learning something - it might never be heard!
• Substitute player knocked unconscious, part of boot on youngster's head
• Fail to learn part properly, as actor?