Greek portico
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">greek portico</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for stoa that I've seen before include "In Athens some columns" , "Portico in ancient Greece" , "old school" , "Zeno's place" , "Portico or roofed colonnade" .)