Crossword Genius

Letter-writer makes typo oddly when entering his other name (2,4)

Ross

I believe the answer is:

st paul

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

'letter-writer makes typo oddly when entering his other name' is the definition.
The definition suggests a singular noun which matches the answer.

'letter-writer makes typo oddly when entering his other name' is the wordplay.
I cannot really understand how this works, but
'letter' could be 'u' and 'u' is found in the answer.
'name' could be 'al' and 'al' is found within the leftover letters.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for st paul that I've seen before include "one converted en route" , "He wrote letters to the Corintians and others" , "The first great Christian missionary" , "He was converted to Christianity on the road to Damascus" , "Saul after his conversion" .)

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