Oration broadcast somewhere in Canada (7)
I believe the answer is:
ontario
'somewhere in canada' is the definition.
(Ontario is a province of Canada)
'oration broadcast' is the wordplay.
'broadcast' is an anagram indicator (letters scattered or cast around).
'oration' anagrammed gives 'ONTARIO'.
(Other definitions for ontario that I've seen before include "part of N America" , "Canadian province and Great Lake" , "Most populous Canadian province" , "Province of SE Canada, and a Great Lake" , "One of the Great Lakes" .)