Person who exploits addict (4)

I believe the answer is:

user

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This clue might be a double definition.

'person who exploits' is the first definition.
'user' can be an answer for 'person' (user is a kind of person). I'm not certain of the rest of the definition.

'addict' is the second definition.
(drug user)

Can you help me to learn more?

(Other definitions for user that I've seen before include "Manipulator" , "One exploiting others" , "Person taking drugs" , "Operator; drug addict" , "Drug addict (informal)" .)

I've seen this clue in The Irish Times.

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