Crossword Genius

Cake-making product that meant a lot to the Romans (3)

Ross

I believe the answer is:

mix

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'product that meant a lot to the romans' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for mix that I've seen before include "Stir or blend" , "Amalgamate, blend" , "Blend together" , "= 1,009 (L.)" , "Combine into one" .)

I've seen this clue in the Evening Standard.
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