Comparison figure (4)
I believe the answer is:
norm
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">comparison figure</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 norm that I've seen before include "Most frequent state" , "Expected standard" , "Typical pattern or situation" , "What is conventional, regular" , "Mean" .)