Crossword Genius

How one comes to confess (5)

Ross

I believe the answer is:

clean

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

'to confess' is the definition.
(thesaurus)

'how one' is the wordplay.
I cannot quite see how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is found within the answer.
This explanation may well be incorrect...

'comes' acts as a link.

Can you help me to learn more?

(Other definitions for clean that I've seen before include "Unsoiled" , "Not soiled, free from dirt" , "Quite" , "Remove dirt or stain" , "Uncontaminated" .)

I've seen this clue in The Globe and Mail.
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