Outfox (4)
I believe the answer is:
fool
'outfox' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for fool that I've seen before include "Dupe - dessert" , "Dimwit" , "Jester or silly ass" , "` `More people know Tom .... that Tom .... knows' '" , "Ass - sweet" .)