Huge success (5-3)
I believe the answer is:
smash-hit
'huge success' is the definition.
(a smash hit is something very successful)
This is all the clue.
(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" .)