Literary domain of Peter the Magnificent and Susan the Gentle (6)

I believe the answer is:

narnia

(Other definitions for narnia that I've seen before include "C. S. Lewis imaginary country" , "C.S. Lewis's imaginary country" , "Fictional land of children's literature" , "C.S. Lewis country" , "land for children?" .)

I've seen this clue in The New York Times.

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