Broadcast facts that are a Cockney journalist’s own (11)
I believe the answer is:
acknowledge
'own' is the definition.
(both can mean to admit or accept)
'broadcast facts that are a cockney journalist's' is the wordplay.
I cannot really understand how this works, but
'are' could be 'led' (leading is a kind of being) and 'led' is found within the answer.
'a' is present in the answer.
This explanation may well be incorrect...
(Other definitions for acknowledge that I've seen before include "Admit - recognise - thank" , "Confirm (receipt)" , "Indicate obligation to" , "Confess" , "Admit the truth of (something)" .)