Elaborate ruse (4)
I believe the answer is:
hoax
'elaborate ruse' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hoax that I've seen before include "Humorous or malicious deception" , "Playful fraud" , "Act of deception" , "Kid" , "Deception such as the Piltdown Man" .)