Girl lisped a story (4)

I believe the answer is:

myth

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'story' is the definition.
(I know that myth is a type of story)

I cannot understand how the rest of the clue works.

(Other definitions for myth that I've seen before include "Traditional allegory" , "A widely held but false belief" , "Common false belief" , "Legend; fable" , "Delusion" .)

I've seen this clue in The Guardian.

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