Positive particle (6)

I think it could be either:

proton

cation

'positive particle' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for proton that I've seen before include "One is positive" , "just a little bit" , "Elementary particle found in all atomic nuclei" , "One charged" , "One's charged" .)

I've seen this clue in the New York Times, the Thinks.com, the L.A. Times Daily, the USA Today, the Universal, the King Feature Syndicate and The Washington Post.

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