Possible Clues:

• The Battle of Marston - -
• Wild land; tie up
• What you might do to 'Showboat', or 'Othello'?
• Heath - a North African Muslim
• Land mainly high but low by river
• Use ropes to secure African
• Just dark enough to tie the boat up
• Heathery upland
• eg Ilkley, Othello
• Dark bit of the house back there,. even though it's open