Arena seating sections (5)
I believe the answer is:
tiers
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">arena seating sections</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 tiers that I've seen before include "aprons for kids" , "More than one bank" , "I rest in layers" , "Layers or thicknesses" , "Tries (anag.)" .)