Levels of command (8)
I believe the answer is:
echelons
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">levels of command</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for echelons that I've seen before include "Len chose levels or grades" , "Levels of rank, could be upper" , "Levels of authority" , "Levels or ranks in an organization" .)