Pertaining to the mind (6)
I believe the answer is:
mental
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pertaining to the mind</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for mental that I've seen before include "Nuts" , "Cerebral" , "Cognitive" , "Pertaining to the mind" , "off trolley" .)