Not supporting (4)
I believe the answer is:
anti
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not supporting</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 anti that I've seen before include "Opposition member" , "'No' voter" , "Hostile" , "one opposing?" , "Negative vote" .)