Tapering pillar (7)
I believe the answer is:
obelisk
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tapering pillar</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for obelisk that I've seen before include "Square stone column that tapers" , "Pyramidal monument" , "Cleopatra's Needle, for instance" , "Tapering monumental pillar" , "Tall tapering pillar as monument or landmark" .)