Boom times (3)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">boom times</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 ups that I've seen before include "Positive phases of the cycle" , "Gains and losses - . . . and downs" , "High points" , "peak times?" , "Opposite of downs" .)