Europe’s most active volcano (4)
I believe the answer is:
etna
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">europe's most active volcano</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for etna that I've seen before include "a mount hotly tipped when it runs" , "A feature of Sicily" , "Italian smoker" , "Active European volcano" , "Explosive type" .)