TV programme about flying sausage shown before noon (7)
I believe the answer is:
horizon
'tv programme' is the definition.
(BBC documentary series)
'about flying sausage shown before noon' is the wordplay.
I cannot quite understand how this works, but
'about' could be 'on' (as in a book 'on' a certain topic) and 'on' is found within the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for horizon that I've seen before include "As far as one can see" , "Where the sky appears to meet the earth" , "The line at which the sky and the earth appear to meet" , "As far as the eye can see" , "Earth/sky interface" .)