1979 sci-fi film starring Tom Skerritt and Sigourney Weaver (5)

I believe the answer is:

alien

(Other definitions for alien that I've seen before include "Foreign; extraterrestrial" , "repugnant" , "Belonging to a foreign country" , "Foreigner, outsider" , "Otherworldly" .)

I've seen this clue in The Mirror.

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