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' can be found hidden inside 'vacillating over norwegian'.
(Other definitions for governor that I've seen before include "US politician" , "person put in charge" , "Chief, boss" , "employer" , "warden" .)