Perfect model (5)
I believe the answer is:
ideal
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">perfect 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 ideal that I've seen before include "Perfect; visionary" , "Quite perfect, can't be improved on" , "Perfectly suited" , "Perfect but not likely to become a reality" , "Best possible" .)