Evening with film stars ahead (6)
I believe the answer is:
sunset
'evening' is the definition.
(thesaurus)
'film stars ahead' is the wordplay.
'film' becomes 'et'.
'stars' becomes 'suns' (Sun is an example).
'ahead' means one lot of letters go next to another.
'et' put after 'suns' is 'SUNSET'.
'with' acts as a link.
(Other definitions for sunset that I've seen before include "This in west" , "US nest (anag.)" , "Onset of night" , "'The dying of the 18'" , "The fading light of evening" .)