Cunning and deceitful (3)
I believe the answer is:
sly
'cunning and deceitful' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sly that I've seen before include "Artful" , "Sneaky" , "Cunning, deceitful" , "Wily, shifty" , "Cunning, foxy" .)