Is a modern broadcast haphazardly set up? (9)
I believe the answer is:
randomise
'haphazardly set up?' is the definition.
(I've seen this before)
'is a modern broadcast' is the wordplay.
'broadcast' is an anagram indicator (letters scattered or cast around).
'is'+'a'+'modern'='isamodern'
'isamodern' is an anagram of 'RANDOMISE'.
(Other definitions for randomise that I've seen before include "Haphazardly set up" , "Dire moans (anag.); make unpredictable" , "Shuffle" , "Scrap order" , "Mix up" .)