Crossword Genius

Respectful term is upriver? (3)

Ross

I believe the answer is:

sir

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This clue could be a double definition.

'respectful term' is the first definition.
(I've seen this in another clue)

'upriver?' is the second definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?

'is' is the link.

Can you help me to learn more?

(Other definitions for sir that I've seen before include "Knight's prefix" , "Gentleman's form of address" , "Knight's title" , "Honorary male title" , "Form of address for a knight" .)

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