Moment of sudden realisation (8)

I believe the answer is:

epiphany

(Other definitions for epiphany that I've seen before include "Christian feast of showing Christ to Magi" , "Christian Festival, showing of Christ to the Magi" , "Church festival" , "Festival commemorating the showing of Christ to the Magi" , "January 6 feast" .)

I've seen this clue in the Sydney Morning Herald.

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