Move like a river (4)
I believe the answer is:
flow
'move like a river' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for flow that I've seen before include "Scapa - , Orkney anchorage" , "Uninterrupted stream" , "Run smoothly" , "Steady continuous stream" , "(Forward) movement of liquid" .)