Management level
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">management level</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 tier that I've seen before include "Row (of seats)" , "this person secures" , "Level of a structure" , "One of two or more rows" , "Wedding cake layer" .)