Legendary island on which King Arthur's sword Excalibur was forged (6)

I believe the answer is:

avalon

(Other definitions for avalon that I've seen before include "Morgan le Fay's isle" , "Arthur's Seat" , "Blessed Celtic isle" , "King Arthur's burial place" , "Where King Arthur's body was brought" .)

I've seen this clue in The Independent.

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