Emit smoke
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">emit smoke</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 fume that I've seen before include "Smoke - rage" , "Express great anger" , "Champ at the bit" , "Feel great anger" , "Be mad or angry" .)