Employer of donor disputed ridiculously easy profit (5,3,3,4)
I believe the answer is:
money for old rope
'easy profit' is the definition.
(I've seen this before)
'employer of donor disputed' is the wordplay.
'disputed' is an anagram indicator.
'employer'+'of'+'donor'='employerofdonor'
'employerofdonor' with letters rearranged gives 'MONEY FOR OLD ROPE'.
'ridiculously' is the link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for money for old rope that I've seen before include "Profit for little effort" , "A piece of cake" , "Easy earnings" , "Reward for little effort" , "dealing with elderly guys?" .)