Lending at high interest (5)
I believe the answer is:
usury
'lending at high interest' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for usury that I've seen before include "High-interest lending" , "Money-lending at exorbitant rates" , "Lending of money at exorbitant interest" , "Too much interest" , "Extortionate lending" .)