Paddles round one river bend (4)
I believe the answer is:
oars
'paddles' is the definition.
(I've seen this before)
'round one river bend' is the wordplay.
'round' becomes 'o' (round can mean a round object).
'one river bend' becomes 'ars' (I am not sure about this - if you are sure you should believe this answer much more).
'o'+'ars'='OARS'
Can you help me to learn more?
(Other definitions for oars that I've seen before include "Rowing blades" , "Manually operated boat propellers" , "Sweeps" , "Sculls" , "Implements to propel or steer on water" .)