Hostile reaction (8)
I believe the answer is:
backlash
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hostile reaction</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 backlash that I've seen before include "Sudden violent reaction to an action or situation" , "Strong negative reaction to a development" , "Provoked adverse reaction" , "Violent reaction to an event - using whip?" , "Hostile reaction" .)