Yang's counterpart (3)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">yang's counterpart</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for yin that I've seen before include "Complement of yang" , "Counterpart of yang" , "Comedian Billy Connolly is the big one" , "Chinese female passive principle of universe" , "Yang's counterpart" .)