Imaginary wonderful place (6)
I believe the answer is:
xanadu
'imaginary wonderful place' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for xanadu that I've seen before include "Fabulous place" , "Kubla Khan's place (Coleridge)" , "Where Kubla Khan built his pleasure dome" , "'In . . . . . . did Kubla Khan / a stately pleasure-dome decree' (Coleridge)" , "ideal place" .)