Chances (4)
'chances' is the definition.
(the odds of something happening)
This is all the clue.
(Other definitions for odds that I've seen before include "The likelihood of something occurring rather than not" , "Chances, probability" , "Likelihood of something happening" , "The chances of something happening" , "at this is in dispute" .)
(Other definitions for are that I've seen before include "is for more than one" , "Era (anag.)" , "live" , "(They/you/we) exist" , "(We/you/they) exist" .)