One or several mainly avoiding odd characters (3)

I believe the answer is:

any

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'one' is the definition.
(any one)

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

(Other definitions for any that I've seen before include "At all; in some degree" , "One or some, whichever you choose" , "One (unspecified)" , "One, no matter which" , "One, some, every or all without specification" .)

I've seen this clue in The Times.

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