Addict taken in because reoffending (4)
I believe the answer is:
user
'addict' is the definition.
(drug user)
'in because reoffending' is the wordplay.
'in' indicates the answer is hidden within the clue.
'USER' is hidden in the letters of 'because reoffending'.
'taken' acts as a link.
(Other definitions for user that I've seen before include "Ruse (anag.)" , "One who works an appliance" , "One taking drugs" , "Drug taker" , "Manipulator" .)