Related Clues:

• Sort of C ask for potassium, for instance
• The instance of potassium?
• Might C. ask to be like this?
• What might be stored in there? Potassium, for instance?
• It could be hard to capsize this vessel
• Cooper's work
• Might C. ask for potassium, for instance?
• What a big, thick mug Gertrude was!
• By the sound of it, see 17 down for this
• The vessel would overturn with the colonel inside it, by the sound of it
• It's hard to turn up with so big a vessel
• It starts to get brown before it can be made dark for the drinker
• It sounds like no light matter to get it hard back here
• Might a hundred question how tubby one has got?
• One might have a century over 17 down for this