Moneylender (6)
I believe the answer is:
usurer
'moneylender' is the definition.
(a usurer is an exploitative moneylender)
This is all the clue.
(Other definitions for usurer that I've seen before include "Loan shark" , "He expects lots of interest" , "Shylock, for example" , "Extortionist" , "Shylock's profession" .)