Terminated objective journalist (5)
I believe the answer is:
ended
'terminated' is the definition.
('end' can be a synonym of 'terminate')
'objective journalist' is the wordplay.
'objective' becomes 'end' (I've seen this before**).
'journalist' becomes 'ed' (short for editor).
'end'+'ed'='ENDED'
(Other definitions for ended that I've seen before include "Culminated" , "Finished, terminated" , "Having come to a conclusion" , "wound-up" , "Concluded" .)