Pays too much when all is said and done for firm linked to partners accommodating writers (15)

'all is said and done for firm linked to partners accommodating writers' is the definition.
I can't tell whether this definition defines the answer.

'pays too much' is the wordplay.
I cannot really understand how this works, but
'pays' could be 'compensates' (compensating is a kind of paying) and 'compensates' is located in the answer.
'too much' could be 'over' (I've seen this in other clues) and 'over' is found in the answer.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).

'when' acts as a link.

Can you help me to learn more?