Two in a row? (4)
I believe the answer is:
oars
'two in a row?' 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 "Propelling implements" , "These could make you row" , "Paddles" , "Boating implements" , "Indirectly, they make waves" .)