They exploit Russell badly, taking £50 off him (5)

I believe the answer is:

users

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'they exploit' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

(Other definitions for users that I've seen before include "Ruses for employers" , "subscribers" , "Drug takers" , "People with a drug habit" , "Operators" .)

I've seen this clue in the Evening Standard.

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