Back part (4)

I believe the answer is:
rear
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">back part</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rear that I've seen before include "Bottom" , "Raise - back" , "Rise up at the back" , "Hind part" , "what you may bring up" .)