Bevel (4)
I believe the answer is:
cant
'bevel' is the definition.
(I know that bevel can be written as cant)
This is the entire clue.
(Other definitions for cant that I've seen before include "Lacks ability" , "Insincere talk; slope" , "Stock phrases made nonsensical by endless repetition" , "Incline, slope" , "Insincere talk, pious platitudes" .)