Possible Clues:

• High-climbing vine
• Jungle climbing plant
• Turn a spike up to make it hang down
• If it's trailing, it needs a nail to get it up
• One found in Julian Alps? Yes and no
• Jungle obstacle
• Climbing-plant, especially one found in tropical forests
• Climber returned a sharp object
• Hawaiian vine
• Climber finding pin up on summit of Andes