Hypocrite (9)
I believe the answer is:
pretender
'hypocrite' is the definition.
(I know that hypocrite can be written as pretender)
This is all the clue.
(Other definitions for pretender that I've seen before include "Claimant to a throne, usually without just title" , "One claiming a title" , "One who claims a title or position" , "fake" , "One acting" .)