Stevenage girl? (3)

I believe the answer is:

ena

I'm a little stuck... Click here to teach me more about this clue!

'girl?' is the definition.
(I've seen this in other clues)

'stevenage' is the wordplay.
'ENA' is hidden within the letters.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for ena that I've seen before include "- - Sharples (TV)" , "- - Sharples ('Coronation Street')" , "First name of Coronation Street's Widow Sharples, d. 1980" .)

I've seen this clue in the Evening Standard.

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