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Though saintly, is wrong one day (5)

Ross

I believe the answer is:

simon

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

'though saintly' is the definition.
I can't tell whether this defines the answer.

'is wrong one day' is the wordplay.
'wrong' indicates an anagram.
'one day' becomes 'mon' (abbreviation for Monday).
'is' anagrammed gives 'si'.
'si'+'mon'='SIMON'

Can you help me to learn more?

(Other definitions for simon that I've seen before include "- and Garfunkel" , "- Templar, The Saint" , "Fellow" , "Simple chap" , "A simple character in nursery rhyme" .)

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