Charged particles (4)
I believe the answer is:
ions
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">charged particles</span>' is the definition.<br/ ><span class="explanation-format__explanation">(electrically charged particles)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ions that I've seen before include "items with a charge" , "Electrically charged particles" , "N in radio comms." , "Charged atom or molecule" , "Electrically-charged particles" .)