Business file (4)
I believe the answer is:
line
This clue is a double definition.
'business' is the first definition.
('line' can be a synonym of 'business')
'file' is the second definition.
(thesaurus)
(Other definitions for line that I've seen before include "Ancestry" , "It's long relative to its width" , "cover on the inside" , "Railway track; policy" , "Some poetic feet; boundary, when drawn" .)