Gunman (7)
I believe the answer is:
shooter
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gunman</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that gunman can be written as shooter)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for shooter that I've seen before include "Gun - ball that keeps unexpectedly low" , "One from Arsenal" , "one fired" , "aiming to score goal?" , "Gun (sl.)" .)