The —, 1996 action film starring Billy Zane, Kristy Swanson and Treat Williams (7)

I believe the answer is:

phantom

(Other definitions for phantom that I've seen before include "Ghost of the Opera" , "Something creepy" , "shadow of his former self?" , "Illusion (at the opera?)" , "Ballet-dancing costume" .)

I've seen this clue in The Mirror.

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