Stop argument in northern town (6)
I believe the answer is:
barrow
'northern town' is the definition.
(I've seen this before)
'stop argument' is the wordplay.
'stop' becomes 'bar' (bar can mean to stop or prevent).
'argument' becomes 'row' (to row is to argue).
'bar'+'row'='BARROW'
'in' is the link.
(Other definitions for barrow that I've seen before include "Cart used by street vendor" , "Ancient burial mound" , "Cart; grave mound" , "Small hand-propelled cart" , "Cumbrian town" .)