Crossword Genius

His is a very exacting business (6)

Ross

I believe the answer is:

usurer

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'his is a very exacting business' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is all the clue.

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(Other definitions for usurer that I've seen before include "Grasping money lender" , "Unrestrained money lender" , "Extortionist" , "One who charges excessive interest" , "Iniquitous moneylender" .)

I've seen this clue in The Globe and Mail and The Irish News.
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