Rubbish found in the ship's bottom (5)
I believe the answer is:
bilge
This could be a double definition.
'rubbish' is the first definition.
(I've seen this before)
'ship's bottom' is the second definition.
'bilge' can be an answer for 'bottom' (bilge is a kind of bottom). I am not sure about the 'ship's' bit.
'found in the' acts as a link.
Can you help me to learn more?
(Other definitions for bilge that I've seen before include "Dirty water collecting on a vessel" , "Rubbish, nonsense; dirty water in ship" , "Hogwash" , "Lowest internal portion of a ship's hull" , "bull" .)