Pharisee admitting ignoble end for gentile is right (9)
I believe the answer is:
privilege
'is right' is the definition.
(privilege can mean a right to do something)
'pharisee admitting ignoble end for gentile' is the wordplay.
'pharisee' becomes 'prig' (both can mean a sanctimonious person).
'admitting' means one lot of letters goes inside another (admit can mean to welcome in or accept).
'ignoble' becomes 'vile' (both can mean despicable).
'end for' says to take the final letters.
The last letter of 'gentile' is 'e'.
'prig' going around 'vile' is 'privileg'.
'privileg'+'e'='PRIVILEGE'
(Other definitions for privilege that I've seen before include "Exclusive right" , "authorisation" , "Honour" , "conditional benefit?" , "Prerogative" .)