Hypocritically holy (13)
I believe the answer is:
sanctimonious
'hypocritically holy' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sanctimonious that I've seen before include "Making show of being morally superior" , "Hypocritically moral" , "Affecting piety" , "Canting" , "Self-righteous" .)