Still beginning to shout the odds? (5)
I believe the answer is:
evens
'the odds?' is the definition.
(I've seen this before)
'still beginning to shout' is the wordplay.
'still' becomes 'even' ('even' can be a synonym of 'still').
'beginning to' suggests taking the first letters.
The initial letter of 'shout' is 's'.
'even'+'s'='EVENS'
(Other definitions for evens that I've seen before include "50-50 chance" , "In betting, winning the amount staked" , "Oddly, these could be odds" , "Balanced odds" , "50:50 probability" .)