2015 biopic starring Johnny Depp as Whitey Bulger (5,4)

I believe the answer is:

black mass

(Other definitions for black mass that I've seen before include "Satanist rite" , "Satanic ritual of darkest hue" , "Diabolical goings-on" , "heap of coal?" , "Blasphemous travesty of a Christian service" .)

I've seen this clue in The Mirror.

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