Edible, you can have it in cakes (4)

I believe the answer is:

fish

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'edible' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for fish that I've seen before include "Aquatic animal" , "Angle, troll" , "Aquarium" , "Eg, sturgeon" , "Possibly the sole" .)

I've seen this clue in the Evening Standard.

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