Hypocrisy (4)
I believe the answer is:
cant
'hypocrisy' is the definition.
(I've seen this in other clues)
This is all the clue.
(Other definitions for cant that I've seen before include "of words with specialised meaning" , "Special jargon of a group" , "Pious claptrap" , "Not able to" , "make a lot pay?" .)