Gap; room (5)
I believe the answer is:
space
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">gap</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">room</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for space that I've seen before include ""The final frontier"" , "Blank" , "A particular area for paces" , "sci-fi theme" , "Empty area, may be outer" .)