Jam, or maybe a piece of cake (5)

I believe the answer is:

wedge

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'piece of cake' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for wedge that I've seen before include "Golf club, V-shape" , "Jam" , "Tapered insert" , "Chock" , "Significant amount of money (informal)" .)

I've seen this clue in the Evening Standard.

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