Odds still short (5)
I believe the answer is:
evens
'odds' is the definition.
(I've seen this before)
'still short' is the wordplay.
'still' becomes 'evenso' ('even so' can be a synonym of 'still').
'short' means to remove the last letter.
'evenso' with its last letter removed is 'EVENS'.
(Other definitions for evens that I've seen before include "less likely than 27 [ODDS-ON]" , "Kind of betting odds on seven" , "Oddly, these could be odds" , "Half a chance" , "Likelihood" .)