Anxiety for the firm (7)
I believe the answer is:
concern
I believe this clue is a double definition.
'anxiety' is the first definition.
(concern is a kind of anxiety)
'the firm' is the second definition.
(both can mean an business)
'for' acts as a link.
(Other definitions for concern that I've seen before include "Business - worry" , "Feeling of anxiety or sympathy" , "Business organisation" , "Involve" , "Firm - interest" .)