Nav. rank (3)
I believe the answer is:
ens
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nav rank</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ens that I've seen before include "Entity" , "Printing measures" .)