Older, higher in rank (6)
I believe the answer is:
senior
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">older</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">higher in rank</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for senior that I've seen before include "High-ranking" , "Higher in rank or age" , "Elder person - higher in rank" , "More advanced in years or authority" , "Being old" .)