Possible Clues:

• Stanley may get at it, by the sound of it, as a substitute
• Deputy endlessly on his feet?
• Representative - a good man, and popular
• Greenwood's supporting actor, further characterized as 'groom only'
• Substitute with status finally disappearing
• the locum is on his feet in here
• Position no good for a locum
• Vocal pieces
• Status detailed for substitute
• Understudy is nearly permanent