Argued; propelled a boat (5)
I believe the answer is:
rowed
I believe this is a double definition.
'argued' is the first definition.
(I've seen this before)
'propelled a boat' is the second definition.
(I've seen this in another clue)
(Other definitions for rowed that I've seen before include "Oared" , "Created a noisy squabble" , "argued" , "Sculled" , "Went boating; quarrelled" .)