Related Clues:

• What might be stored in there? Potassium, for instance?
• Cooper's work
• Might C. ask for potassium, for instance?
• By the sound of it, see 17 down for this
• One might have a century over 17 down for this
• Might C, get to ask for such a lot of drink?
• The sort of container that may follow a 5 down
• 'E's got about one kilogram for this container
• Might C ask for potassium, for instance?
• Box with a mate and be fortified
• It's meant, by the sound of it, to be 5 down (4)
• Might potassium, for instance, come by the barrel?
• In court this could suit the carrier
• The instance of potassium for the vessel
• There's likely to be something in this matter in court