It's at the stern, even when going backwards (4)

I believe the answer is:

poop

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I'm afraid I can't explain this answer.

(Other definitions for poop that I've seen before include "Deck at stern of ship" , "raised structure" , "Fool" , "Whichever way you see them, the facts" , "Tony" .)

I've seen this clue in the Evening Standard.

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