Junior officer (10)
I believe the answer is:
lieutenant
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">junior officer</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lieutenant that I've seen before include "Army rank" , "UK rank below captain" , "Assistant" , "e.g. one on French side who had a woman?" , "Army officer" .)