Volatile situation (7,4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">volatile situation</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tinderbox that I've seen before include "Volatile situation" , "Old container for fire-lighting equipment" , "Volatile person" , "Old lighter" , "Situation that is a potential source of violence" .)
(Other definitions for hornets nest that I've seen before include "Stirred up it's dangerous" , "(Stir up a) violent reaction" , "Something not to be stirred up" , "hazardous situation" , "Big trouble!" .)