Mother wit (4)
I believe the answer is:
nous
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mother wit</span>' is the definition.<br/ ><span class="explanation-format__explanation">(nous is a kind of mother wit)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for nous that I've seen before include "we recognised in Nancy" , "Gumption" , "Common sense: mind or reason" , "Common-sense" , "Knowledge, experience" .)