Attack from hiding (6)
I believe the answer is:
ambush
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">attack from hiding</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ambush that I've seen before include "An attack launched from hiding" , "Lying in wait to attack" , "Waylaying" , "Surprise attack" , "Jump" .)