A contrarian's comeuppance? (8)

I believe the answer is:

downfall

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'comeuppance?' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

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(Other definitions for downfall that I've seen before include "burst of rain" , "Collapse, ruin" , "heavy rain" , "Ruin, humiliation" , "Loss of power or prosperity, a serious tumble" .)

I've seen this clue in The Times.

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