The most common and most likely answer to this crossword clue is the 9 letter word EXCALIBUR
I've seen this crossword clue in Financial Times
E
X
C
A
L
I
B
U
R
More clues leading to the result EXCALIBUR
- Sword European unknown primarily carried before burial at sea
- *Weapon to make one cub relax
- Popular brand set in stone
- Sword passed on by Charlie before burial at sea
- Weapon of unknown gauge announced
- Brand associated with Arthur
- Brand that’s well-known without needing statement of quality
- Legendary brand’s former quality, as proclaimed?
- Former quality discussed in legendary brand
- A club fixer’s heading off to develop one of our team
Buddy explains!
The straight part
We know that "Weapon" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case weapon = excalibur.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.