Dirty water that collects in a ship's hull (5)

I believe the answer is:

bilge

(Other definitions for bilge that I've seen before include "Rubbish - water in boat" , "bull" , "(Water at) bottom of ship" , "Filthy water that collects in the bottom of a boat" , "Rubbish, nonsense; dirty water in ship" .)

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

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