Fit for occupation (7)
I believe the answer is:
seizure
I believe this clue is a double definition.
'fit' is the first definition.
(thesaurus)
'occupation' is the second definition.
(thesaurus)
'for' acts as a link.
(Other definitions for seizure that I've seen before include "Attack - capture" , "Sudden fit" , "Apprehension" , "Act of grabbing" , "Paroxysm" .)