Crossword Genius

See Californian policeman retiring after a revelation (10)

Ross

I believe the answer is:

apocalypse

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'revelation' is the definition.
(synonyms)

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(Other definitions for apocalypse that I've seen before include "Catastrophic event" , "World's end" , "End of the world" , "sacred book" , "This last book" .)

I've seen this clue in The Times.
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