It’s involved in rowing with a bonehead, we hear (5)
I believe the answer is:
scull
'hear' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how one could define the other.
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for scull that I've seen before include "Light rowing boat" , "Row with two oars" , "A single oar" , "racing shell" , "Blade" .)