Job over in the bank satisfied them (4)
I believe the answer is:
task
'job' is the definition.
(I know that job can be written as task)
'over in the bank satisfied them' is the wordplay.
'over' shows that the letters should be reversed in order.
'in' indicates the answer is hidden within the clue.
'ksat' is hidden within 'bank satisfied them'.
'ksat' written backwards gives 'TASK'.
(Other definitions for task that I've seen before include "Piece of work to be done" , "Difficult piece of work" , "Burden with work" , "Chore, job." , "Give mission" .)