Bottom of the boat (5)

I believe the answer is:

bilge

(Other definitions for bilge that I've seen before include "(Water at) bottom of ship" , "Rubbish like waste water in ship" , "Nonsense (informal)" , "Dirty water collecting on a vessel" , "Filthy water that collects in the bottom of a boat" .)

I've seen this clue in The Guardian.

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