Possible Clues:

• Volcanic crater plays a part in topographical derangement
• Large crater
• Large volcanic crater — race lad (anag)
• Volcanic feature about to consume tree
• Bad lad taken into care, possibly an occasional smoker?
• Irish friend led astray inside crater
• A hot-looking French lake recalled as product of volcanism
• Deep depression around area — tree sinks into it
• Volcanic opening about to swallow tree
• Crater roughly enclosing tree