Two short tools for fool (4)
I believe the answer is:
hoax
'fool' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
(Other definitions for hoax that I've seen before include "Leg-pull" , "Playful fraud" , "Act of deception" , "Deception such as the Piltdown Man" , "Fool" .)