Harshly rebuked rotter named by Spooner (10)

I believe the answer is:

keelhauled

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'harshly rebuked' is the definition.
The definition suggests a past participle verb which matches the answer.

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

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(Other definitions for keelhauled that I've seen before include "down in the main" , "Punished beneath a ship" .)

I've seen this clue in The Sunday Times and The Times.

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