Thrown up, passed out, necking port (6)

I believe the answer is:

odessa

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'port' is the definition.
(Odessa is a Ukrainian port)

'thrown up passed out necking' is the wordplay.
'ODESSA' is hidden back-to-front within the letters.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for odessa that I've seen before include "Battleship Potemkin mutiny port" , "Ukrainian naval base" , "Seaport" , "Do seas come into Ukrainian city?" , "Ukrainian Black Sea port" .)

I've seen this clue in The Independent.

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