Crossword Genius

Sheffield girl (5)

Ross

I believe the answer is:

effie

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

'girl' is the definition.

'sheffield' is the wordplay.
'EFFIE' is hidden within the letters.
But, I am uncertain how this is indicated.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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