Highest in rank (7)
I believe the answer is:
supreme
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">highest in rank</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 supreme that I've seen before include "over the top" , "Greatest in status, authority or power" , "Most important" , "topmost level" , "Greatest, highest in excellence" .)