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Betting odds, numbers originally cut (5)

Ross

I believe the answer is:

evens

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'betting odds' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

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(Other definitions for evens that I've seen before include "50-50 chance" , "Level betting" , "Levels - odds" , "Bookies' odds matching the amount staked" , "Quits" .)

I've seen this clue in The Telegraph.
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