Talk about Northern fancy (6)
I believe the answer is:
ornate
'fancy' is the definition.
(I've seen this in another clue)
'talk about northern' is the wordplay.
'talk' becomes 'orate' (to orate is to give a speech).
'about' means one lot of letters goes inside another.
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'orate' enclosing 'n' is 'ORNATE'.
(Other definitions for ornate that I've seen before include "Richly or elaborately decorated" , "Flash" , "Ostentatious" , "(Of literary style) complex and with unusual words" , "Rich in decorative detail" .)