Back of neck (4)
I believe the answer is:
nape
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">back of neck</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 nape that I've seen before include "Scruff of the neck" , "Here's a hairline" , "Girl personifying France" , "Back part of the neck" , "It's a pane in the neck" .)