Computer key
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">computer key</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for space bar that I've seen before include "Largest typewriter key" , "It's on the bottom row of a keyboard" , "Restaurant at the End of the Universe?" , "used by typists?" , "provision for thirsty astronauts?" .)