Mysterious, magical (6)
I believe the answer is:
occult
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">mysterious</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that mysterious can be written as occult)</span><br/ ><br/ >'<span class="explanation-format__original">magical</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for occult that I've seen before include "Hidden; mystical" , "Secret - paranormal" , "Secret - supernatural" , "Involving magical powers" , "Involving the supernatural, esoteric" .)