Crossword Genius

What's more odd, you've never seen him before (8)

Ross

I believe the answer is:

stranger

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

'you've never seen him before' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'what's more odd' is the wordplay.
I cannot really see how this works, but
'odd' could be 'strange' (I've seen this before) and 'strange' is found in the answer.
A single letter 'r' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for stranger that I've seen before include "More odd or weird" , "Alien, foreigner" , "The unknown one is more unusual" , "Non-acquaintance" , "Outsider" .)

I've seen this clue in The Globe and Mail.
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