She's back from Basildon (4)

I believe the answer is:

lisa

'she's' is the definition.

'back from basildon' is the wordplay.
'back' says the letters should be written backwards.
'from' says the answer is hidden in the clue.
'asil' is hidden within 'basildon'.
'asil' back-to-front is 'LISA'.

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

I've seen this clue in the Evening Standard.

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