Lacuna, hiatus (3)
I believe the answer is:
gap
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">lacuna</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">hiatus</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for gap that I've seen before include "Narrow opening" , "Disparity" , "Cleft" , "Interval, space" , "Empty space between things" .)