Film failed to be broadcast (4)
I believe the answer is:
mist
'film' is the definition.
(thesaurus)
'failed to be broadcast' is the wordplay.
'failed' becomes 'missed' (missing is a kind of failing).
'to be broadcast' indicates a 'sounds like' (homophone) clue (how the word might sound on the radio or TV).
'missed' sounds like 'MIST'.
(Other definitions for mist that I've seen before include "Fine spray" , "Cloud; thin fog" , "Watery vapour" , "Slight fog" , "low-level cloud" .)