Proper journalist's loaded (6)
I believe the answer is:
primed
'loaded' is the definition.
(thesaurus)
'proper journalist's' is the wordplay.
'proper' becomes 'prim' ('prim' can be similar in meaning to 'proper').
'journalist' becomes 'ed' (short for editor).
'prim'+'ed'='PRIMED'
(Other definitions for primed that I've seen before include "Made ready (to fire)" , "Prepared something for use or action" , "Filled in" , "Briefed - ready" , "Made ready for action" .)