Troy (5)
I believe the answer is:
ilium
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">troy</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that troy can be written as Ilium)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ilium that I've seen before include "hip (at least in part)" , "classical city" , "Whence Aeneas fled" , "Part of skeleton" , "Hipbone" .)