Crossword Genius

Unattractive betting (4-2)

Ross

I believe the answer is:

odds-on

(Other definitions for odds-on that I've seen before include "With success more likely than failure - check with bookie" , "Rated likely to win" , "With favourable chances" , "Better than evens" , "Very likely to happen" .)

I've seen this clue in the Sydney Morning Herald.
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