Rowed, as a boat (5)
I believe the answer is:
oared
'rowed as a boat' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for oared that I've seen before include "Equipped with rowing blades" , "Provided with motive power" , "Rowed" , "(Of a boat) provided with rowing blades" , "Prepared for a row" .)