But they could be evens! (4)

I believe the answer is:

odds

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'they could be evens' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for odds that I've seen before include "Probabilities" , "Things not even" , "inequality" , "(In betting) chances" , "Partial darkness" .)

I've seen this clue in the Evening Standard.

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