A rowing boat blade (6)
I believe the answer is:
cutter
This clue could be a double definition.
'a rowing boat' is the first definition.
'cutter' can be an answer for 'boat' (cutter is a kind of sailing vessel). I'm unsure of the 'a rowing' bit.
'blade' is the second definition.
(thesaurus)
Can you help me to learn more?
(Other definitions for cutter that I've seen before include "Ship's boat" , "Small fast sailing ship - sounds sharp" , "E.g. knife" , "Small sailing ship or a knife" , "Slicing tool of fast sailing ship" .)