Cost upsetting neighbour? (4)
I believe the answer is:
scot
'neighbour?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'cost upsetting' is the wordplay.
'upsetting' is an anagram indicator.
'cost' with letters rearranged gives 'SCOT'.
Can you help me to learn more?
(Other definitions for scot that I've seen before include "Eg, a Glaswegian" , "Ancient tax" , "One from north of the border" , "Someone from Dundee?" , "One from northern UK" .)