Biblical sinner turned saint: person with time to reform (5,5)
I believe the answer is:
simon peter
'biblical sinner turned saint' is the definition.
'person with time to reform' is the wordplay.
'with' means one lot of letters go next to another.
'to reform' indicates anagramming the letters.
'person'+'time'='persontime'
'persontime' is an anagram of 'SIMON PETER'.
(Other definitions for simon peter that I've seen before include "Apostle" , "Witness to the Transfiguration" , "Pope, originally" , "Disciple" , "One of Christ's apostles" .)