Supporting column (6)
(Other definitions for stanchion that I've seen before include "Upright" , "Post or rod used as a support" , "Vertical post or rod as a support" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">supporting column</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 pillar that I've seen before include "Building support" , "Vertical stone support" , "person providing reliable support" , "Upright column" , "Stylite would live on it" .)