Possible Clues:

• Worker with a ledger
• Worker who tracks transactions
• Accounts official got from reserve team member
• One who keeps track of ins and outs
• Office worker disliked by librarians?
• Bishop has three letters duplicated by accountant
• Specialist in double-entry accounting
• Accountant likely to be fined, when returning?
• Figures checker
• Librarian ensuring all returns are duly dealt with?