Commander vacillating over Norwegian sector (8)
I believe the answer is:
governor
'commander' is the definition.
(thesaurus)
'vacillating over norwegian sector' is the wordplay.
'sector' says the answer is hidden in the clue.
'GOVERNOR' is hidden in the letters of 'vacillating over norwegian'.
(Other definitions for governor that I've seen before include "US politician" , "person put in charge" , "Chief, boss" , "employer" , "warden" .)