Skull (7)
I believe the answer is:
cranium
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">skull</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 cranium that I've seen before include "Part of the skull" , "Brainpan" , "hard case" , "Skull, bones enclosing brain" , "Brain container" .)