Possible Clues:

• Not the average Joe!
• 'Service not included' is the usual thing
• Name for an average guy?
• 100 for an I.Q.
• Mister on the turn-up, as is usual
• There isn't a mister back to give 13 across a start, as usual
• Standard example of opera, with ending drawn out
• It's the usual thing, Mister, to get up on this
• The magistrate is missing, it seems, but that's par for the course
• As is par for the course, the magistrate is absent