Sounds like unrefined material for making a blade (3)
I believe the answer is:
oar
'blade' is the definition.
(blade is the word for oar in competitive rowing)
'sounds like unrefined material' is the wordplay.
'sounds like' shows a homophone (sound like).
'unrefined material' becomes 'ore' (I've seen this in another clue).
'ore' sounds like 'OAR'.
'for making a' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for oar that I've seen before include "Manual boat propeller" , "Rowing device" , "Rowing implement" , "spoon?" , "Propelling blade" .)