Contentious (13)
I believe the answer is:
controversial
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">contentious</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 controversial that I've seen before include "Arousing dispute" , "Causing heated debate" , "Tendentious" , "At issue" , "Open to question" .)