That won't be a problem (2,5)
I believe the answer is:
no sweat
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">that won't be a problem</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for no sweat that I've seen before include "There shouldn't be any objection" , "Don't worry" , "fine" , "It's not a problem (result of using antiperspirant?)" , "OK" .)