TV cockney sneered at broadcast (9)
I believe the answer is:
eastender
'tv cockney' is the definition.
(from the TV soap EastEnders)
'sneered at broadcast' is the wordplay.
'broadcast' is an anagram indicator (letters scattered or cast around).
'sneered'+'at'='sneeredat'
'sneeredat' is an anagram of 'EASTENDER'.
(Other definitions for eastender that I've seen before include "Butcher perhaps" , "eg Barbara Windsor" , "Someone born within the sound of Bow Bells?" , "Cockney" , "Pearly Queen surely is" .)