Mentions a rogue state (9)
I believe the answer is:
minnesota
'state' is the definition.
(Minnesota is an example)
'mentions a rogue' is the wordplay.
'rogue' indicates an anagram.
'mentions'+'a'='mentionsa'
'mentionsa' is an anagram of 'MINNESOTA'.
(Other definitions for minnesota that I've seen before include "Nominates, oddly, the US state" , "US state -. of Iowa" , "North Star State" , "Wobegon state (Keillor)" , "US state, capital St Paul" .)