Possible Clues:

• One working on the roof?
• Marksman shooting people from a concealed place
• Gunman runs through again from South
• Local drops people from time to time, as understands the importance of 13 down
• Person who criticises Queen chasing bargain
• He aims to be unseen by the enemy
• 'American ___' (2014 movie about, in many ways, what it means to be an American)
• Rifleman given piece of cake by Queen?
• One shooting bird by river
• Concealed sharpshooter