Possible Clues:

• The cool van always loses its cool
• Opening in earth's crust ejecting molten matter
• Short book about a Conservative raised in St Helens?
• Does coal come out of this during Nov? (7)
• Coal is in Nov, but may suddenly come out of it
• Does the coal in Nov. get around to blowing its top?
• Very twisty col on a kind of mountain
• Hole in crust here producing an eructation
• Ante back for one such
• eg Vesuvius