A riot - no trouble for province (7)
I believe the answer is:
ontario
'province' is the definition.
(Ontario is an example)
'a riot no trouble' is the wordplay.
'trouble' is an anagram indicator.
'a'+'riot'+'no'='ariotno'
'ariotno' anagrammed gives 'ONTARIO'.
'for' is the link.
(Other definitions for ontario that I've seen before include "Smallest of the Great Lakes" , "Canadian province and Great Lake" , "One of the Great Lakes" , "city" , "part of N America" .)