Mistreated (6)
I believe the answer is:
abused
'mistreated' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for abused that I've seen before include "Reviled, or used wrongly like drugs" , "Reviled or exploited" , "Offended" , "Treated cruelly; insulted" , "Insulted; violated" .)