Extremely old (7)
I believe the answer is:
archaic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">extremely old</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(Other definitions for archaic that I've seen before include "Belonging to former or ancient times" , "Ancient or out of date" , "Belonging to former times like some words" , "A long way out of date" , "Outdated" .)