Sharpshooter employed in the rigging (7)
I believe the answer is:
deadeye
'sharpshooter' is the definition.
(thesaurus)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for deadeye that I've seen before include "Expert marksman" , "Ace marksman" , "One secures a shroud" , "Crack shot" , "Wooden block to take a lanyard" .)