One generating a lot of interest? (6)
I believe the answer is:
usurer
'one generating a lot of interest?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for usurer that I've seen before include "Unscrupulous moneylender" , "Extortionist" , "Grasping money lender" , "Moneylender who charges exorbitant rates" , "Unscrupulous lender" .)