Possible Clues:

• Legendary weapon no longer having quality, we hear
• Vegas hotel with a name from English legend
• Well-known brand set in stone
• Former quality spoken of mythical brand
• Brand associated with Arthur
• A club fixer's heading off to develop one of our team
• Name of King Arthur's sword
• Lady of the Lake's gift
• Legendary brand's former quality, as proclaimed?
• Legendary weapon