Possible Clues:

• Musical drama extremely tiresome work
• Musical drama by Lawrence found to be effective
• Control a machine
• Queen replaces one in drug work
• (Of machine) function
• Function with speech held outside gym
• At first put on in the theatre to work in the theatre
• Starts in the theatre and all in the theatre
• Speak formally about exercise to conduct
• Work in the theatre, work for the theatre, to start with