How to punish a fishing-boat (5)

I believe the answer is:

smack

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'boat' is the definition.
(smack is a kind of sailing vessel)

I can't explain the remainder of the clue.

(Other definitions for smack that I've seen before include "Hit with an open hand" , "Loud kiss" , "Sharp blow; sailing boat" , "Hit - kiss - fishing boat - heroin" , "Suggestion" .)

I've seen this clue in the Sydney Morning Herald.

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