Pretence (4)
'pretence' is the definition.
(both can mean a facade or fake display)
This is the entire clue.
(Other definitions for sham that I've seen before include "Pretense; bogus" , "Bogus hams" , "imitation" , "Mock" , "Mash, being counterfeit" .)
(Other definitions for feint that I've seen before include "Artifice" , "Make slight movement to divert, as in fencing" , "Deceptive movement designed to distract" , "Sell a dummy" , "ruled lightly" .)