Related Clues:

• Concrete or reilable
• State of matter not solid or liquid
• Firm, strong
• Three-dimensional shape, not hollow
• It's neither solid nor liquid
• It's not liquid or solid, like American petrol
• Hydrogen or oxygen, say
• Hydrogen or methane, say
• Substance like air
• Not hollow, the same throughout
• Go down and go off; go up to go down - that's great!
• It's great that he's cut after this
• It may be great in Ireland to make the cargo in America, perhaps
• It could be great to make light of it
• It might be great to turn and go down