Possible Clues:

• Close to camp, European's moving clear of northern fog
• Dense yellow fog
• Letter marvellous to read out -- in which there are no clear views?
• Power lies with Europe manoeuvring around as it's hard to see through
• Character, outstanding on the radio, that's hard to see through
• Summit mostly delightful about old thick fog
• Peer up, so distraught about a thick fog
• Dense mist
• Parking tricky as Europe in thick fog
• One's not at all clear or sure -- a pope should clarify