Land of Arthurian legend (6)
I believe the answer is:
avalon
'land of arthurian legend' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for avalon that I've seen before include "Morgan le Fay's isle" , "Isle of Celtic myth" , "Where King Arthur was conveyed after death" , "Island paradise of Arthurian legend" , "Isle of the Blessed in Arthurian legend" .)