Possible Clues:

• Drunk in Spain offering most of underground chamber with key
• About to introduce museum's wine
• Sparkler brought back by one on holiday
• Sparkling wine offered by knight? Not half
• Chelsea and Villa wingers fizz
• White sparkling wine similar to champagne
• Western and eastern states producing fizz
• Vena -- (major blood vessel)
• Anatomical term that's Latin for 'hollow'
• Superior vena --