Crossword Genius

What generates much interest as a rule needs everything to be right (5)

Ross

I believe the answer is:

usury

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(Other definitions for usury that I've seen before include "Demanding excessive interest" , "Practice of charging excessive interest" , "Lending at high interest rates" , "Loan sharking" , "Grasping moneylending" .)

I've seen this clue in The Independent.
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