Stopped working case with journalist (6)
I believe the answer is:
ceased
'stopped' is the definition.
('cease' can be a synonym of 'stop')
'working case with journalist' is the wordplay.
'working' is an anagram indicator.
'with' says to put letters next to each other.
'journalist' becomes 'ed' (short for editor).
'case' is an anagram of 'ceas'.
'ceas'+'ed'='CEASED'
(Other definitions for ceased that I've seen before include "Came to an end" , "Stopped, quit" , "Stopped, desisted" , "Terminated" , "Concluded" .)