Crossword Genius

What one's doing is fighting (6)

Ross

I believe the answer is:

action

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

'is fighting' is the definition.
(I've seen this before)

'what one's doing' is the wordplay.
I cannot quite see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
The remaining letters 'acton' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for action that I've seen before include "Litigation" , "Accomplishment" , "Jarndyce and Jarndyce, say" , "Battle - suit" , "claim in court" .)

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