On air to broadcast in Canadian province (7)
I believe the answer is:
ontario
'canadian province' is the definition.
(Ontario is an example)
'on air to broadcast' is the wordplay.
'broadcast' is an anagram indicator (letters scattered or cast around).
'air'+'to'='airto'
'airto' is an anagram of 'tario'.
'on'+'tario'='ONTARIO'
'in' is the link.
(Other definitions for ontario that I've seen before include "Province of SE Canada, and a Great Lake" , "Canadian province and Great Lake" , "Province of central Canada" , "one of the provinces" , "Smallest of the Great Lakes" .)