Crossword Genius

A betting certainty? (4-2)

Ross

I believe the answer is:

odds-on

(Other definitions for odds-on that I've seen before include "A better than even chance of success" , "High probability" , "More likely to win than lose" , "With success more likely than favour in bookie's phrase" , "Better than evens" .)

I've seen this clue in The Sun.
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