Artillery soldier (6)
I believe the answer is:
gunner
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">artillery soldier</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for gunner that I've seen before include "Private in the Royal Artillery" , "Artilleryman" , "Artillery soldier" .)