Art of disputation (8)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">art of disputation</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 polemics that I've seen before include "arguments" , "Compiles into verbal attacks on beliefs" , "Complies with verbal attacks on opinions" .)