Braincase (7)
I believe the answer is:
cranium
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">braincase</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cranium that I've seen before include "The skull, major head bone" , "Skull of a vertebrate" , "Brain container" , "Skull that encloses the brain" , "Braincase" .)