Shylock's crime (5)
I believe the answer is:
usury
'shylock's crime' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for usury that I've seen before include "Taking great interest" , "High-interest lending" , "Extortionate lending" , "Shylock's calling" , "Loaning money at high interest" .)