Layers, levels (5)
I believe the answer is:
tiers
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">layers</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know this)</span><br/ ><br/ >'<span class="explanation-format__original">levels</span>' is the second definition.<br/ ><span class="explanation-format__explanation">('tier' can be a synonym of 'level')</span><br/ ><br/ ></span>
(Other definitions for tiers that I've seen before include "Layers, levels" , "Layers, strata" , "Tries (anag.)" , "aprons for kids" , "Layers or thicknesses" .)