Owner of house next door? And a goat, possibly (7)
I believe the answer is:
abutter
'owner of house next door?' is the definition.
(abut means to join or neighbour)
'a goat possibly' is the wordplay.
'goat possibly' becomes 'butter' (animal that butts).
'a'+'butter'='ABUTTER'
'and' acts as a link.
(Other definitions for abutter that I've seen before include "Neighbouring property owner" , "neighbourly sort?" , "Neighbour" .)