I reshape eccentric self-righteous person (8)
I believe the answer is:
pharisee
'self-righteous person' is the definition.
(I've seen this before)
'i reshape eccentric' is the wordplay.
'eccentric' indicates anagramming the letters.
'i'+'reshape'='ireshape'
'ireshape' is an anagram of 'PHARISEE'.
(Other definitions for pharisee that I've seen before include "(Gospel) hypocrite" , "Self-righteous person - one of an ancient Jewish sect" , "A Biblical hypocrite" , "Ancient Jewish sectarian" , "Ancient Jew" .)