Province of person elected in Ireland (6)
I believe the answer is:
empire
'province' is the definition.
(thesaurus)
'person elected in ireland' is the wordplay.
'person elected' becomes 'mp' (Member of Parliament).
'in' means one lot of letters goes inside another.
'ireland' becomes 'eire' ('Eire' can be a synonym of 'ireland').
'mp' placed into 'eire' is 'EMPIRE'.
'of' acts as a link.
(Other definitions for empire that I've seen before include "Wide dominion" , "Group of countries under one authority" , "Huge domain or group of companies" , "Over which 23 down rules" , "In state of New York" .)