Possible Clues:

• Reward for capturing knight, very important fellow
• Sounds like photography of royalty
• 6's Wessex is 11
• The sound of photographs of royalty
• What you have to pay around the North to go with 7 down
• Sounds as if the originals are not for royalty
• What highness costs around the North
• Sounds as if they're not originally royal
• Pincer movement around the royal
• Not the royal negatives, by the sound of it