Story young girl lisped (4)

I believe the answer is:

myth

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'story' is the definition.
(myth is a kind of story)

I don't understand how the rest of the clue works.

(Other definitions for myth that I've seen before include "Tall tale" , "Fancy" , "Delusion" , "Fanciful story" , "Illusion" .)

I've seen this clue in The Guardian and The Times.

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