Possible Clues:

• Mean to be like one that's sure to be in the old city
• Certain shark
• One taking a lot of interest more certain to go to university
• Mean to demand more than enough interest
• One taking a lot of interest to be certain in old city
• One always takes a great interest in everything
• One taking great interest?
• Former name for money-lender
• On the mobile, you are certain to crack moneylender
• One lending money at unreasonable rates