Colonnaded porch
I believe the answer is:
terrace
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">colonnaded porch</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 terrace that I've seen before include "stand" , "Veranda" , "Row of housing" , "Domestic row" , "Row of usually identical and connected houses" .)