Possible Clues:

• On the mountains, negotiating summit with oxygen, at the world's extremities
• Hint received by an old cleric who may be Victorian
• Relating to Australia/New Zealand
• From Australia and New Zealand
• Brit's description of Aussie doctors in a notepad
• Articles about head-lines read in New Zealand
• Coming from other side of the world
• A new suggestion by old cleric down under
• Mountainous round summit, needing oxygen at extreme point
• One paid out to chase worker from the South