Jack on outside broadcast work (3)
I believe the answer is:
job
'work' is the definition.
(synonyms)
'jack on outside broadcast' is the wordplay.
'jack' becomes 'j' (playing card abbreviation).
'on' is a charade indicator (letters next to each other).
'outside broadcast' becomes 'ob'.
'j'+'ob'='JOB'
(Other definitions for job that I've seen before include "Assignment" , "Task; paid position" , "Misfortunate man of the Bible" , "Patient figure in the Bible - task" , "Post" .)