Electrically charged atom formed by the loss or gain of one or more electrons (3)

I believe the answer is:

ion

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

I've seen this clue in The Mirror.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.