The —, 1976 film thriller starring Gregory Peck and Lee Remick (4)

I believe the answer is:

omen

(Other definitions for omen that I've seen before include "Portent of evil" , "Augur" , "Forewarning, harbinger" , "Foreshadow" , "Harbinger, augury" .)

I've seen this clue in The Mirror.

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