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In which visa appears to hand over the red wine (8)

Ross

I believe the answer is:

passport

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'in which visa appears' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'hand over the red wine' is the wordplay.
'hand' becomes 'pass' (synonyms).
'over' says to put letters next to each other (in a down clue, some letters go over others).
'the red wine' becomes 'port' (I've seen this in another clue).
'pass'+'port'='PASSPORT'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for passport that I've seen before include "Official document required for foreign travel" , "Travel identification" , "you might need Visa with this" , "International identification document" , "Travel ID" .)

I've seen this clue in the Sydney Morning Herald.
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