Overwhelming victory or success (5,5)
I believe the answer is:
clean sweep
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">overwhelming victory</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">success</span>' is the second definition.<br/ ><br/ ></span>
(Other definitions for clean sweep that I've seen before include "Complete achievement of objectives" , "That's when you get everything going" , "Complete change; winning all the trophies" .)