Crossword Genius

Made to copy Joan of Arc, say (4)

Ross

I believe the answer is:

maid

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'say' is the definition.
Although both the answer and definition are singular nouns, I don't understand 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 maid that I've seen before include "Female servant - young girl" , "daughter?" , "Serving girl" , "Young woman - servant" , "Damsel" .)

I've seen this clue in the Evening Standard.
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