Chef's business satisfactory (4)
I believe the answer is:
cook
'chef's' is the definition.
(thesaurus)
'business satisfactory' is the wordplay.
'business' becomes 'co'.
'satisfactory' becomes 'ok' ('ok' can be similar in meaning to 'satisfactory').
'co'+'ok'='COOK'
(Other definitions for cook that I've seen before include "Captain of HMS Endeavour" , "Kitchen worker" , "New England Test captain" , "Brown?" , "Famous sailor" .)