Private soldier (7)
I believe the answer is:
trooper
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">private soldier</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for trooper that I've seen before include "Cavalryman" , "He swears" , "Proverbially swearing soldier" , "ship" , "Cavalry soldier" .)