It's news broadcast for viewer (7)
I believe the answer is:
witness
'for viewer' is the definition.
(synonyms)
'it's news broadcast' is the wordplay.
'broadcast' indicates an anagram (letters scattered or cast around).
'its'+'news'='itsnews'
'itsnews' is an anagram of 'WITNESS'.
(Other definitions for witness that I've seen before include "Observe - evidence" , "It's news (anag.)" , "Court testifier" , "Onlooker" , "Observer" .)