A news broadcast fades (5)
I believe the answer is:
wanes
'fades' is the definition.
(I've seen this in another clue)
'a news broadcast' is the wordplay.
'broadcast' is an anagram indicator (letters scattered or cast around).
'a'+'news'='anews'
'anews' anagrammed gives 'WANES'.
(Other definitions for wanes that I've seen before include "Grows smaller like the moon" , "Of the moon, gradually decreases" , "Decreases in vigour or strength like the moon" , "Gradually declines" .)