Popular Nissan model (6)
I believe the answer is:
maxima
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">popular nissan model</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 maxima that I've seen before include "greatest possible amounts" , "Largest numbers" , "extremely high values" , "Highest points" , "Largest amounts" .)