Crossword Genius

Endless upset about copper nabbing one wise man (9)

Ross

I believe the answer is:

confucius

I'm a little stuck... Click here to teach me more about this clue!

'endless upset about copper' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'nabbing one wise man' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
'man' could be 'con' and 'con' is found within the answer.
The remaining letters 'fucus' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for confucius that I've seen before include "Chinese sage" , "teacher?" , "Early Chinese philosopher" , "Oriental sage" , "The most influential of Chinese philosophers" .)

I've seen this clue in The Guardian.
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