Fox's trait (7)
I believe the answer is:
slyness
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fox's trait</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for slyness that I've seen before include "Cunning behaviour" , "Cunning; guile" .)