Aptly enough, it's at the back of the ship (4)

I believe the answer is:

poop

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'ship' is the definition.
(thesaurus)

I don't understand the rest of the clue.

(Other definitions for poop that I've seen before include "Palindromic part of a ship" , "Fool" , "Highest deck of ship" , "Whichever way you see them, the facts" , "Exhaust" .)

I've seen this clue in the Evening Standard.

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