Up to that moment (5)
I believe the answer is:
until
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">up to that moment</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for until that I've seen before include "Before a given time" , "Not beyond (hour)" , "As far as" , "Unlit (anag.)" , "Pending such time as" .)