Llanelli girl? (4)

I believe the answer is:

nell

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'girl?' is the definition.
(girl's name)

'llanelli' is the wordplay.
'NELL' is hidden within the letters.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for nell that I've seen before include "Orphan girl" , "- - Gwynne" , "little Miss Trent?" , "-- Gwyn, royal favourite" , "Dickensian heroine" .)

I've seen this clue in the Evening Standard.

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