Spaciousness (9)
I believe the answer is:
roominess
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spaciousness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that spaciousness can be written as roominess)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for roominess that I've seen before include "near-emptyness of space" , "Capaciousness" .)