Clue: Sharpshooter's employed in the rigging (7)
Answer: DEADEYE
Explanation: Sharpshooter's employed in the rigging (7)
Double definition. 
As well as being a sharpshooter, a deadeye is an item used in the rigging of sailing ships. It's a round wooden disc with holes through it, perpendicular to the plane of the disc.