Crossword Genius

It’s involved in rowing with a bonehead, we hear (5)

Ross

I believe the answer is:

scull

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'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.

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(Other definitions for scull that I've seen before include "Light rowing boat" , "Row with two oars" , "A single oar" , "racing shell" , "Blade" .)

I've seen this clue in the Evening Standard.
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