One dairy products, or two? (5,6)

I believe the answer is:

cream cheese

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'one' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

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

Can you help me to learn more?

(Other definitions for cream cheese that I've seen before include "something for those crackers" , "Food" , "Rich dairy product" , "White foodstuff" , "Soft dairy product" .)

I've seen this clue in The Mirror.

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