Obscure stuff (6)
I believe the answer is:
arcana
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">obscure stuff</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 arcana that I've seen before include "Secret things" , "Tarot cards" , "Secrets, mysteries" .)