Predominant (6)
I believe the answer is:
ruling
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">predominant</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ruling that I've seen before include "Verdict" , "Drawing a fine line" , "Court decision" , "Exercising power or authority" , "Judge's decision" .)