Exploited unlimited jabs and took drugs (6)
I believe the answer is:
abused
'exploited' is the definition.
(I've seen this before)
'unlimited jabs and took drugs' is the wordplay.
'unlimited' says to take the centre (remove the limits/outer letters).
'and' is a charade indicator (letters next to each other).
'took drugs' becomes 'used' (to use can mean to take drugs).
The middle letters of 'jabs' are 'ab'.
'ab'+'used'='ABUSED'
(Other definitions for abused that I've seen before include "Ill-treated" , "Insulted; violated" , "Reviled, or used wrongly like drugs" , "Reviled or misused" , "Mistreated" .)