Bones of the spinal column (9)
I believe the answer is:
vertebrae
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bones of the spinal column</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for vertebrae that I've seen before include "Bits of bone" , "Bits of skeleton" , "Bones of back" , "Bony segments of the spinal column" , "Backbone segments" .)