Idyllic realm, as per Coleridge (6)

I believe the answer is:

xanadu

(Other definitions for xanadu that I've seen before include "old Chinese summer capital" , "Where Kubla Khan decreed his pleasure-dome be built" , "Where Kubla Khan built his pleasure dome" , "Kubla Khan's capital as in Coleridge's poem" , "Idyllic location" .)

I've seen this clue in the Sydney Morning Herald.

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