Chances of winning? (4)
I believe the answer is:
odds
'chances of winning?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for odds that I've seen before include "Chances of occurrence" , "Things not even" , "at which one may be disagreeing" , "Indicator of likely betting winnings" , "Estimate of likelihood" .)