Possible Clues:

• Organiser
• Professional musician
• Orchestrator, perhaps
• One orchestrating a bishop's displeasure
• Beside a river see estate officer who's involved in planning?
• Sort of composer, a m-man working in the countryside?
• One who organises
• One adapting a piece of music
• A bishop's given to wrath - someone fiddling with hymn tunes?
• One adapting music