Most of the meat delivered to the zoo? (5,5)

I believe the answer is:

lions share

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'most' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for lions share that I've seen before include "Largest part" , "Principal part" , "Main part" , "Largest portion" , "For the greater part" .)

I've seen this clue in the Evening Standard.

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