Crossword Genius

What current working involves? (3)

Ross

I believe the answer is:

ion

I'm a little stuck... Click here to teach me more about this clue!

'what current working involves?' is the definition.
I can't judge whether this defines the answer.

'what current working' is the wordplay.
I cannot quite see how this works, but
'current' could be 'i' (symbol for electric current) and 'i' is found in the answer.
'working' could be 'on' (on can mean working or activated) and 'on' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

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

I've seen this clue in The Independent.
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