Uneven chances (4)

I believe the answer is:

odds

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'uneven chances' is the definition.
'odds' can be an answer for 'chances' (the odds of something happening). I am unsure of the 'uneven' bit.

'uneven chances' is the wordplay.
'uneven' becomes 'odd' (I've seen this in another clue).
'chances' becomes 's' (I can't justify this - if you can you should give a lot more credence to this answer).
'odd'+'s'='ODDS'

Can you help me to learn more?

(Other definitions for odds that I've seen before include "Betting ratio" , "at which one may be disagreeing" , "Things not even" , "Scraps" , "Perhaps even money" .)

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

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