Abut (6)
I believe the answer is:
adjoin
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">abut</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for adjoin that I've seen before include "Be next or nearest to" , "Be next to, like building" , "Of building, be situated next to" , "20 down" , "Interconnect" .)