Historical object (5)
I believe the answer is:
relic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">historical object</span>' is the definition.<br/ ><span class="explanation-format__explanation">(a relic is an ancient object)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for relic that I've seen before include "Old memento" , "Memorial of saint" , "(Holy) remains" , "Left over item, sometimes sacred" , "Surviving ancient custom" .)