Breakfast dish served in prison (8)

I believe the answer is:

porridge

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'breakfast dish' is the definition.
(I've seen this in another clue)

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

Can you help me to learn more?

(Other definitions for porridge that I've seen before include "Breakfast food - prison term" , "hot stuff?" , "Breakfast food - time inside" , "Spell in jail and breakfast food" , "Hot breakfast food" .)

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