Food ingredient women's group found in a dirt cart overturned (8,4)

I believe the answer is:

tartaric acid

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

I can't explain the rest of the clue.

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(Another definition for tartaric acid that I've seen is " Compound used in baking powders".)

I've seen this clue in The Irish Times.

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