Up to the time of (5)
I believe the answer is:
until
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">up to the time of</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 until that I've seen before include "Pending such time as" , "Unlit (anag.)" , "Up to (a point in time)" , "As late as" , "Before a given time" .)