At the same time that (5)
I believe the answer is:
while
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">at the same time that</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 while that I've seen before include "During the time that, as long as" , "Space of time" , "Whereas" .)