Outbreak (8)
I believe the answer is:
eruption
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">outbreak</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that outbreak can be written as eruption)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for eruption that I've seen before include "Volcanic outpouring" , "which blighted Pompeii?" , "Violent outbreak as by volcano" , "A violent breaking out, as of volcano" , "Spot or rash appearing suddenly on the skin" .)