Stranger's film? (5)
I believe the answer is:
alien
I believe this clue is a double definition.
'stranger's' is the first definition.
(synonyms)
'film?' is the second definition.
(1979 film)
(Other definitions for alien that I've seen before include "Stranger" , "ET" , "Foreigner, outsider" , "Belonging to a foreign country" , "Someone from outer space?" .)