Sweet trick (4)
I believe the answer is:
fool
I believe this is a double definition.
'sweet' is the first definition.
(type of dessert or sweet)
'trick' is the second definition.
(I've seen this in another clue)
(Other definitions for fool that I've seen before include "Empty-headed person" , "Nincompoop" , "twit" , "Dupe - dessert" , "Sweet - trick" .)