Violent whirling wind-storm (7)
I believe the answer is:
tornado
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">violent whirling wind</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">storm</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(type of weather)</span><br/ ><br/ ></span>
(Other definitions for tornado that I've seen before include "Terrible current" , "Windy hazard" , "Rapidly whirling column of air" , "Road not turned in the windstorm" , "lot of wind" .)