Labour cleared broadcast (7)
I believe the answer is:
declare
'broadcast' is the definition.
(thesaurus)
'labour cleared' is the wordplay.
'labour' is an anagram indicator (the letters must be worked or laboured on).
'cleared' with letters rearranged gives 'DECLARE'.
(Other definitions for declare that I've seen before include "Announce formally" , "Profess" , "say" , "Make a statement, to customs perhaps" , "... cut short innings" .)