Ali's girl? (4)

I believe the answer is:

lisa

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'girl?' is the definition.

'ali's' is the wordplay.
'ali's' anagrams to 'LISA'.
But, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for lisa that I've seen before include "Most intelligent of Marge Simpson's children" , "Girl" , "Mona . . . ., famous painting by Leonardo da Vinci" , "Mona ..., also called La Gioconda" , "Leonardo da Vinci painted the 'Mona ....'" .)

I've seen this clue in the Evening Standard.

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