One living next door (9)
I believe the answer is:
neighbour
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">one living next door</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 neighbour that I've seen before include "Exist near" , "Someone in the street" , "sit next to" , "One at your side" , "Huge Robin (anag.)" .)