Small firework (5)
I believe the answer is:
squib
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small firework</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 squib that I've seen before include "Jumping firework" , "piece of satire" , "Firework (disappointing, if damp)" , "Small explosive, may be damp" , "little banger" .)