Crossword Genius

One providing street with numbers? (6)

Ross

I believe the answer is:

busker

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

'one providing street with numbers?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'one' is the wordplay.
I cannot quite see how this works, but
'one' could be 'er' (I've seen this in other clues) and 'er' is present in the answer.
The remaining letters 'busk' 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 busker that I've seen before include "player in street" , "Public entertainer" , "Street musician" , "Street entertainer" , "Street performer" .)

I've seen this clue in The Sun.
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