A storm (7)
I believe the answer is:
tempest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a storm</span>' is the definition.<br/ ><span class="explanation-format__explanation">(tempest is a kind of storm)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tempest that I've seen before include "Bad weather" , "commotion" , "Cyclone" , "An angry storm as in Shakespeare play" , "violent uproar" .)