King Arthur’s sword (9)

I believe the answer is:

excalibur

'king arthur's sword' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for excalibur that I've seen before include "Legendary weapon" , "King Arthur's magic sword" , "King Arthur's magical sword" , "Traditional weapon" , "Steel flourished years ago" .)

I've seen this clue in the Jonesin', The Telegraph, the Sydney Morning Herald, The Times, The Guardian and the Jonesin Crosswords.

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