Wherein to eat jam? (4)
I believe the answer is:
mess
'jam?' is the definition.
(both can mean a difficult situation)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for mess that I've seen before include "pap" , "dish" , "Canteen - chaos" , "sloppy > food" , "Where one might eat" .)