Be next to (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">be next to</span>' is the definition.<br/ ><span class="explanation-format__explanation">(to adjoin is to be next to something)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for adjoin that I've seen before include "Of building, be situated next to" , "Be next to, say building" , "Abut, border" , "Neighbour" , "Lie adjacent to another" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">be next to</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 abut that I've seen before include "Touch, lean on" , "Be next door to" , "Cease (from activity)" , "Touch (side of next building)" , "Meet" .)