Up to the time of (5)
I believe the answer is:
until
'up to the time of' is the definition.
(I've seen this in another clue)
This is all the clue.
(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" .)