Caught fire (7)
I believe the answer is:
ignited
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">caught fire</span>' is the definition.<br/ ><span class="explanation-format__explanation">('ignite' can be a synonym of 'catch fire')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ignited that I've seen before include "Set alight" , "Sparked off" , "Caught fire" , "Gin diet (anag.)" , "Kindled" .)