Crossword Genius

To the extent that one's battling still (2,2,3)

Ross

I believe the answer is:

in so far

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

'to' is the definition.
Both the answer and definition are adverbs.
Perhaps they are linked in a way I don't understand?

'extent that one's battling still' is the wordplay.
I cannot really see how this works, but
'still' could be 'sofar' (I've seen this in another clue) and 'sofar' is present in the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
A single letter 'n' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

'the' is the link.

Can you help me to learn more?

(Other definitions for in so far that I've seen before include "Inasmuch" , "To the degree or extent that" .)

I've seen this clue in the Evening Standard.
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