In which too much interest is taken (5)

I believe the answer is:

usury

I'm a little stuck... Click here to teach me more about this clue!

But I can't explain it at all! Could you help me understand?

(Other definitions for usury that I've seen before include "Demanding excessive interest" , "Loan sharking" , "Exorbitant or unlawful rate of interest" , "Loaning money at high interest" , "Grasping moneylending" .)

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.