The Cardiff Giant, for one (4)
I believe the answer is:
hoax
'the cardiff giant for one' 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 "Imposture" , "Deliberate trickery" , "Humorous or malicious deception" , "cod" , "Prank" .)