Point in time (6)
I believe the answer is:
moment
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">point in time</span>' is the definition.<br/ ><span class="explanation-format__explanation">(moment is a kind of point in time)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for moment that I've seen before include "tick" , "An exact point of time" , "A very brief portion of time" , "Significance; minute" , "Second, importance" .)