Very severe (8)
I believe the answer is:
grievous
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">very severe</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 grievous that I've seen before include "Legal assault charge" , "distressing" , "The "G" of GBH" , "Causing distress" , "Serious, as bodily harm may be" .)