Adjoins (5)
I believe the answer is:
abuts
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">adjoins</span>' is the definition.<br/ ><span class="explanation-format__explanation">(abutting is a kind of adjoining)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for abuts that I've seen before include "Lies adjacent to another" , "borders" , "Of building, is next to" , "Touches, leans on" , "Ends or leans against" .)