Kublai Khan's summer capital (6)

I believe the answer is:

xanadu

(Other definitions for xanadu that I've seen before include "Where Kubla Khan decreed a pleasure dome" , "Coleridge's imagined place of great beauty" , "Place in poem by Coleridge" , "poet's city" , "Kubla Khan's place (Coleridge)" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.