Movement of money (4,4)
I believe the answer is:
cash flow
'movement of money' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cash flow that I've seen before include "Ins and outs of money" , "Movement of rhino" , "A must for solvent businesses" , "Movement of money" , "business's finances" .)