Nahuatl language (5)
I believe the answer is:
aztec
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nahuatl language</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 "old American" , "Montezuma ruled this empire" , "American people" , "Ancient inhabitant of Mexico before Spanish conquest" , "Ancient Mexican-Indian" .)