Convincingly but delicately went after the business (8)
I believe the answer is:
cogently
'convincingly' is the definition.
(I've seen this in another clue)
'went after the business' is the wordplay.
'went' becomes 'gently' (I can't explain this - if you can you should believe this answer much more).
'after' means one lot of letters go next to another.
'the business' becomes 'co' (short for company).
'gently' put after 'co' is 'COGENTLY'.
'but delicately' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for cogently that I've seen before include "with force" , "Persuasively, convincingly" .)