This course is your comeuppance, I say! (7)

I believe the answer is:

dessert

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'this course' is the definition.
(dessert is a kind of course)

I can't explain the remainder of the clue.

(Other definitions for dessert that I've seen before include "Charlotte maybe" , "Christmas pudding maybe" , "Sweet, last course of a meal" , "Sweet, afters" , "Pudding, sweet" .)

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

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