Oar said to belong to jolly Roger (5)

I believe the answer is:

scull

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'oar' is the definition.
(I know that scull is a type of oar)

I don't understand how the remainder of the clue works.

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

I've seen this clue in the Evening Standard.

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