1) Highly interesting man 2) One kind of moneylender 3) One of great interest 4) Predator of sorts 5) Risky funding source 6) Ruthless moneylender 7) School banker 8) Shylock 9) Usurer 10) Usurious critter with jaws 
someone who lends mob money at an exorbitant interest rate; a shylock.