Sweet thing with lapel put up (8)

I believe the answer is:

flapjack

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'sweet thing' is the definition.
(flapjacks are sweet food items)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for flapjack that I've seen before include "American pancake" , "Thick oat biscuit" , "Biscuit of rolled oats and syrup" , "Oaty biscuit; US pancake" , "Chewy oat biscuit" .)

I've seen this clue in The Guardian.

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