Ignore having no case to take on extra executive (8)
I believe the answer is:
governor
'executive' is the definition.
(thesaurus)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for governor that I've seen before include "Official in charge of town/region" , "State ruler" , "chief magistrate)" , "Some misgiving over Norse ruler" , "warden" .)