Crossword Genius

One person of many (3)

Ross

I believe the answer is:

man

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

'one' is the definition.
(thesaurus)

'person of many' is the wordplay.
I cannot really see how this works, but
'many' could be 'm' (Roman numeral for a thousand) and 'm' is found in the answer.
The remaining letters 'an' 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 man that I've seen before include "Vassal; chess piece" , "Attendant" , "Valet" , "Male person" , "See 24" .)

I've seen this clue in the Evening Standard.
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