Powerful leader rigged the odds going to bust criminal (3,5)
I believe the answer is:
big daddy
'powerful leader' is the definition.
(big daddy can mean the head of an organisation)
'rigged the odds going to bust criminal' is the wordplay.
'the odds' indicates alternate letters (letters in odd-numbered positions).
'going to bust' indicates putting letters inside (some letters bust into others).
'criminal' becomes 'baddy' (bad guy).
The alternating letters of 'rigged' are 'igd'.
'igd' placed into 'baddy' is 'BIG DADDY'.
(Another definition for big daddy that I've seen is " Shirley Crabtree, in the ring".)