Possible Clues:

• Risky funding source
• One garnering lots of interest
• Takes a lot of interest in cash advance from great white school
• Usury expert
• Subprime mortgagee, to detractors
• It's something one gets from bank for one of those in school with Shylock
• Solitary-sounding nurse, perhaps — one making costly advances!
• The banks are giving out to literary type - listen, as one likes to take more interest
• One lends money at excessive rates of interest
• One generating a lot of interest