Business -- one of seven, famously not following fishing dispute (3,3)
I believe the answer is:
cod war
'fishing dispute' is the definition.
(I've seen this before)
'business one of seven famously not' is the wordplay.
I cannot quite see how this works, but
'business' could be 'co' (short for company) and 'co' is located in the answer.
'one' could be 'a' (a thing is one thing) and 'a' is located in the answer.
This explanation may well be incorrect...
'following' acts as a link.
Can you help me to learn more?
(Other definitions for cod war that I've seen before include "Conflict over the water" , "maritime conflict" , "rows once around Iceland" , "Net disagreement" , "fishing dispute" .)