Where men might eat jam (4)
I believe the answer is:
mess
I believe this is a double definition.
'where men might eat' is the first definition.
(I've seen this before)
'jam' is the second definition.
(both can mean a difficult situation)
(Other definitions for mess that I've seen before include "dirty and unpleasant" , "Disarray" , "State of confusion or untidiness" , "Forces' dining room" , "Military dining area" .)