Show follows sort of blue film (8,7)
I believe the answer is:
midnight express
'film' is the definition.
(1978 film)
'show follows sort of blue' is the wordplay.
'show' becomes 'express' (synonyms).
'follows' means one lot of letters go next to another.
'sort of blue' becomes 'midnight' (midnight blue is a shade of blue).
'express' put after 'midnight' is 'MIDNIGHT EXPRESS'.
(Other definitions for midnight express that I've seen before include "very early edition of newspaper?" , "film" .)