CCCWC March competition voters’ comments on Clue no. 14

A clue to EXCALIBUR.
4 comments refer to this clue (from 4 competitors, 0 others)

Here is the text

Comments on the clue

1.	Calibre is a property of some weapons, not the weapon itself
2.	I don't think calibre = weapon. Apart from that, "is" doesn't seem like the right linkword.
3.	Don't see how calibre = weapon.
4.	Calibre is not a weapon.