Rower's implements (4)
I believe the answer is:
oars
'rowers' implements' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for oars that I've seen before include "Paddles" , "Implements to propel or steer on water" , "Indirectly, they make waves" , "Propelling implements" , "Manually operated boat propellers" .)