The sound of river's gentle flow (4)
I believe the answer is:
ooze
'gentle flow' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ooze that I've seen before include "Percolate" , "Gentle flow" , "Emit" , "... sweat" , "Mud at bottom of river" .)