Be in a neighbourly location (6)
I believe the answer is:
adjoin
'be in a neighbourly location' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how they can define each other.
'be in a' is the wordplay.
I cannot really see how this works, but
'in' is found in the answer.
'a' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for adjoin that I've seen before include "Be next to (something)" , "20 down" , "Be next to, say building" , "Of building, be situated next to" , "Meet - touch" .)