Crossword Genius

It's not free of charge (3)

Ross

I believe the answer is:

ion

'it's not free of charge' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ion that I've seen before include "Electrically-charged particle" , "Electrically charged particle" , "Charged atom/molecule" , "Electrically charged atom or group of atoms" , "Eletrically charged particle" .)

I've seen this clue in the Newsday and The Wall Street Journal.
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