One woman in seven (3)

I believe the answer is:

eve

'one woman' is the definition.
(I know that Eve is a adult female)

'in seven' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EVE' is hidden in the letters of 'seven'.

(Other definitions for eve that I've seen before include "Mother of Abel" , "comes before Jan. 1st" , "when it gets dark" , "Brink" , "Adam's partner" .)

I've seen this clue in the Evening Standard.

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