Column; pier (6)
I believe the answer is:
pillar
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">column</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(both can mean an upright structure)</span><br/ ><br/ >'<span class="explanation-format__original">pier</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for pillar that I've seen before include "Column; admired member (of community)" , "Column, support" , "Supporting column" , "Tall vertical structure, of stone say" , "Vertical stone support" .)