Fancy pillowcase (4)
I believe the answer is:
sham
'fancy pillowcase' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sham that I've seen before include "Bogus hams" , "Phoney, bogus" , "Unreal" , "Pretense; bogus" , "Pretence; bogus, false" .)