Not even chances? (4)
I believe the answer is:
odds
'chances?' is the definition.
(I've seen this before)
'not even' is the wordplay.
'not' becomes 'o' (I've seen this in other clues).
'even' becomes 'dds' (I can't justify this - if you can you should give a lot more credence to this answer).
'o'+'dds'='ODDS'
Can you help me to learn more?
(Other definitions for odds that I've seen before include "familiar to our betters?" , "Probabilities" , "Things not even" , "Likelihood of something happening" , "ten to one?" .)