Possible Clues:

• Assert one's right to
• Assert (a right)
• What you can make if you're covered
• He's reluctant to speak about a single demand
• Ask for single shellfish to be brought round
• A speechless type, I accepted title
• Alibi, e.g.
• Assertion (of ownership etc)
• How a hundred and fifty say they take it with the gun (5)
• Prospector's piece of land