Hole ___ (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hole</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that cavity is a type of hole)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cavity that I've seen before include "Destination for a filling!" , "Hollow place" , "Hole, gap" , "A hole could mean work for the dentist" , "Hollow space" .)
(Another definition for inone that I've seen is " United".)