Crafty behaviour (5)
I believe the answer is:
guile
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">crafty behaviour</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 guile that I've seen before include "Crafty behaviour" , "Sly intelligence" , "Cunning intelligence" , "Slyness" , "Cunning, deceit" .)