More than likely to give you a good run for your money? (4-2)
I believe the answer is:
odds-on
'more than likely' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for odds-on that I've seen before include "With success more likely as bookie would calculate" , "High probability" , "Bookie's assessment of success being more likely than failure" , "A better than even chance of success" , "With success more likely than favour - ask bookie" .)