It also goes up high at the stern (4)

I believe the answer is:

poop

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'the stern' is the definition.
('poop' can be a synonym of 'stern')

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for poop that I've seen before include "Exhaust" , "Deck at the rear of a ship" , "raised structure" , "Fool" , "Highest aftmost deck" .)

I've seen this clue in the Evening Standard.

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