Sweet pickle! (3)
I believe the answer is:
jam
I believe this clue is a double definition.
'sweet' is the first definition.
(jam is a kind of sweet)
'pickle' is the second definition.
(both can mean a problem or difficulty)
(Other definitions for jam that I've seen before include "Sweet stuff for bread - stuff it in" , "Fruit preserve" , "Spread; improvise (jazz)" , "Preserve; pack tightly" , "Preserve - predicament" .)