Hoedown in a brand new northern church (4,5)
I believe the answer is:
barn dance
'hoedown' is the definition.
(I've seen this before)
'a brand new northern church' is the wordplay.
'new' indicates an anagram.
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'church' becomes 'ce' (abbreviation for Church of England).
'a'+'brand'='abrand'
'abrand' is an anagram of 'barnda'.
'barnda'+'n'+'ce'='BARN DANCE'
'in' is the link.
(Other definitions for barn dance that I've seen before include "Rural entertainment" , "Kind of social event with traditional music" , "disco at the farm" , "Country entertainment" , "Country social gathering" .)