Ancient Mexican (5)
I believe the answer is:
aztec
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ancient mexican</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 aztec that I've seen before include "Early Mexican civilisation" , "Old Mexican Indian" , "Old person" , "Central American language" , "Historical S. American" .)