She can turn out to be an upper-class niece (6)

I believe the answer is:

eunice

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'she' is the definition.
(I've seen this before)

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

(Other definitions for eunice that I've seen before include "Woman" , "Girl" , "Girl's name" , "Female name deriving from happy victory in Greek" .)

I've seen this clue in The Globe and Mail.

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