Hypocritical speech (4)
I believe the answer is:
cant
'hypocritical speech' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for cant that I've seen before include "tilt" , "of words with specialised meaning" , "Affected use of moral sentiments" , "Hypocritical talk sounds unable" , "Lacks ability" .)