Moneylender who charges very high interest (6)
I believe the answer is:
usurer
'moneylender who charges very high interest' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for usurer that I've seen before include "Unscrupulous moneylender" , "Unrestrained money lender" , "Extortionate moneylender" , "Loan shark" , "One who charges undue interest" .)