Works in 15 across and in 24 across and 24 down

I believe the answer is:

milkmaid

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for milkmaid that I've seen before include "Woman working on dairy farm" , "8th" , "Traditional dairy farm worker" , "old farm worker" , "Female in dairy" .)

I've seen this clue in the Irish Times.

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