Bone-related (6)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bone-related</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for osteal that I've seen before include "skeleton may be thus described" , "Bony" , "Relating to bone - so late (anag)" , "made of bone" , "of bones" .)