Huge success (5-3)
I believe the answer is:
smash-hit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">huge success</span>' is the definition.<br/ ><span class="explanation-format__explanation">(a smash hit is something very successful)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for smash-hit that I've seen before include "Very successful show" , "Of play, great success - sounds destructive" , "'Overwhelming success, of a song say (5,3)'" , "Blockbuster with huge sales" , "Big success for play or musical - sounds violent" .)