Extortionate lender (6)
I believe the answer is:
usurer
'extortionate lender' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for usurer that I've seen before include "Iniquitous moneylender" , "Shylock, for example" , "Unfair moneylender" , "Lender at an exorbitant rate" , "Shylock, say" .)