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A North American dope at the back of the ship (5)

Ross

I believe the answer is:

apoop

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'a north american' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'dope at the back of the ship' is the wordplay.
'dope' becomes 'poop' ('poop' can be a synonym of 'dope').
'at' is a charade indicator (letters next to each other) (I've seen this in other clues).
'the back of the ship' becomes 'a' (I can't justify this - if you can you should believe this answer much more).
'poop' put after 'a' is 'APOOP'.

Can you help me to learn more?

(Another definition for apoop that I've seen is " in the rear".)

I've seen this clue in The Independent.
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