The act of stealing (5)
I believe the answer is:
theft
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">the act of stealing</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 theft that I've seen before include "1 across" , "A 19" , "Crime of stealing" , "Taking offence?" , "Robbery" .)