Oar made of bone, say (5)
I believe the answer is:
scull
'oar' is the definition.
(I know that scull is a type of oar)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for scull that I've seen before include "Row with two oars" , "Light rowing boat" , "Blade" , "A single oar" , "racing shell" .)