The —, 2013 film thriller starring Ethan Hawke and Lena Headey (5)

I believe the answer is:

purge

(Other definitions for purge that I've seen before include "Get rid of unwanted elements" , "Remove impurities from" , "Exterminate" , "Cleanse, purify" , "Remove undesirable elements" .)

I've seen this clue in The Mirror.

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