Boat paddles (4)
I believe the answer is:
oars
'boat paddles' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oars that I've seen before include "Paddles" , "Rowing equipment" , "Indirectly, they make waves" , "Propelling implements" , "Implements of propulsion on water" .)