Neighbour needs a dairy product (7)
I believe the answer is:
abutter
'neighbour' is the definition.
(I've seen this before)
'a dairy product' is the wordplay.
'dairy product' becomes 'butter' (butter is a kind of dairy product).
'a'+'butter'='ABUTTER'
'needs' is the link.
(Other definitions for abutter that I've seen before include "Neighbouring property owner" , "neighbourly sort?" , "Neighbour" .)