Possible Clues:

• One taking great interest in his work?
• Shylock
• Kind of shark
• Loan shark certainly found in the City once
• Money lender
• A shark is certain to be found in the city
• Grasping money lender
• Grasping moneylender
• He may be a loan shark ___ but is it me who's less certain?
• One who takes the greatest interest in everything