Pious platitudes (4)
I believe the answer is:
cant
'pious platitudes' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for cant that I've seen before include "Pious claptrap" , "Insincere talk; slope" , "Affected use of moral sentiments" , "Insincere talk, pious platitudes" , "Hypocritical talk - sounds negative" .)