Exclusive journalist admitted (5)
I believe the answer is:
owned
'admitted' is the definition.
(own can mean to admit or acknowledge)
'exclusive journalist' is the wordplay.
'exclusive' becomes 'own' (one's own, excluding others).
'journalist' becomes 'ed' (short for editor).
'own'+'ed'='OWNED'
(Other definitions for owned that I've seen before include "to oneself?" , "Had lawful title to" , "Acknowledged" , "Possessed; admitted" , "Had possession of" .)