Exploited (4)
'exploited' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for used that I've seen before include "Exploited group" , "Second-hand; exploited" , "No longer new" , "Put to a purpose" , "Sued, having been employed" .)
'exploited' is the definition.
(I've seen this before)
This is the entire clue.
(Another definition for put-upon that I've seen is " Taken advantage of".)