Neighbourly get-together (6)
I believe the answer is:
social
I believe this clue is a double definition.
'neighbourly' is the first definition.
(thesaurus)
'get-together' is the second definition.
(I've seen this in another clue)
(Other definitions for social that I've seen before include "Living in a community, not solitary" , "Relating to living together in communities" , "Gregarious; gathering" , "Relating to human groups" , "Sort of security" .)