Themes (6)
I believe the answer is:
topics
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">themes</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know this)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for topics that I've seen before include "Subjects of discussions" , "'Subjects, issues (6)'" , "Talking points" , "Subject matters" , "Subjects about optics" .)