Possible Clues:

• Oil patch spread around a banger
• Sausage — oil a patch (anag)
• Sausage and cool drink passed round volunteers
• Greek character devised a plot to acquire a small banger
• Sausage, duck and head of lettuce in fresh chapati
• Sausage with a name derived from the Italian for “onion”
• Joint with soft drink brought round: thanks for the snack
• Some potato? A lot ordered with a snack in the tube
• Fruit in soft drink that's oddly part of 9, maybe?
• Meat product, cold joint AA lot prepared