Crossword Genius

Perhaps Sue overworks (7)

Ross

I believe the answer is:

oeuvres

'overworks' is the definition.
Although both the answer and definition are plural nouns, I cannot see how one could define the other.

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

(Another definition for oeuvres that I've seen is " Bodies of (literary) works".)

I've seen this clue in The Guardian.
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