So as to surprise (8)
I believe the answer is:
unawares
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">so as to surprise</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 unawares that I've seen before include "Unknowingly - by surprise" , "Be taken thus if off-guard" , "Not expecting" , "Unexpectedly, without noticing in new auras" , "New auras may be unexpected" .)