Flashing when naked is a piece of cake (6)

Ross

I believe the answer is:

parkin

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'cake' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for parkin that I've seen before include "Type of gingerbread" , "Ginger oatmeal cake" , "Soft gingerbread" , "Scottish biscuit" , "Variety of gingerbread" .)

I've seen this clue in The Telegraph.

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