Maggie's sister on "The Simpsons" (4)

I believe the answer is:

lisa

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

I've seen this clue in the USA Today.

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