Dance where the last shall be first in mock revelation (10)

I believe the answer is:

apocalypse

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'revelation' is the definition.
(synonyms)

I don't understand the remainder of the clue.

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

I've seen this clue in The Times.

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