Foot soldier (11)
I believe the answer is:
infantryman
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">foot soldier</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that foot soldier can be written as infantryman)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for infantryman that I've seen before include "Private, possibly" , "Foot soldier" , "In Saigon, grunt" .)