He takes an unreasonable amount of interest (6)

I believe the answer is:

usurer

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'he takes an unreasonable amount of interest' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is the entire clue.

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(Other definitions for usurer that I've seen before include "source of interest" , "Grasping money-lender" , "Moneylender who charges exorbitant rates" , "Moneylender who charges very high interest" , "Shylock's profession" .)

I've seen this clue in the Evening Standard.

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