Partly coincide in time (7)
I believe the answer is:
overlap
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">partly coincide in time</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 overlap that I've seen before include "Lie partly on top of" , "Extend beyond edge of a thing and partly cover it" , "Partly hide" , "Extend on top of" , "bit of a coincidence" .)