Film not seen broadcast (4)
I believe the answer is:
mist
This might be a double definition.
'film' is the first definition.
(to film over is to mist or fog over)
'not seen broadcast' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
Can you help me to learn more?
(Other definitions for mist that I've seen before include "Haze" , "Mizzle; light rain" , "Slight fog" , "Obscure" , "Thin layer of fog" .)