The Crossword Centre Clue-Writing Competition

CCCWC March competition voters’ comments
 
Clue no. 16: Excellent assumed name, not as dog letter might be described like this legendary sword.

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A clue to EXCALIBUR.
3 comments refer to this clue (from 3 competitors, 0 others)

Here is the text

Comments on the clue
1.Surface makes no sense to me, I'm afraid
2.I hadn't come across dog letter = R before, it seems a bit obscure. Can't see much sense in the surface.
3.Surface a bit contrived