Possible Clues:

• One regenerating opera is Mr D'Oyly Carte, for example
• Producer of opera is prim dropping piano rendition
• Almost make mark on a city theatre director
• Entertainment manager
• I'm getting source of revenue in operas I organised?
• Promise I falsely made about a run as organiser
• One in Paris and Rome excited promoter
• One putting on a show
• Stage promoter
• Company director - one involved in Paris and Rome