Not a tie, having broken through for province (4,6)
I believe the answer is:
nova scotia
'province' is the definition.
(province of Canada)
'not a tie having broken through' is the wordplay.
'not' becomes 'no' (negative).
'a tie' becomes 'ascot' (Ascot is a type of tie).
'having broken' means one lot of letters goes inside another (inserted letters break into the word).
'through' becomes 'via' (via means going through).
'ascot' going within 'via' is 'vascotia'.
'no'+'vascotia'='NOVA SCOTIA'
'for' acts as a link.
(Other definitions for nova scotia that I've seen before include "Canadian province" , "Canadian peninsula" , "Atlantic region" .)