Explosive abbreviation (3)
I believe the answer is:
tnt
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">explosive abbreviation</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 tnt that I've seen before include "Type of high explosive" , "Explosive stuff" , "Initially, powerful explosive" , "Explosive compound" , "Very powerful explosive, compressed" .)