Difficult situation, conflict, for vessel (6)
I believe the answer is:
jamjar
'vessel' is the definition.
(jamjar is a kind of vessel)
'difficult situation conflict' is the wordplay.
'difficult situation' becomes 'jam' (I have seen 'Troublesome situation' mean 'jam' so perhaps 'situation' could also mean 'jam'. I am not sure about the 'difficult' bit.).
'conflict' becomes 'jar' (if something jars, it conflicts or clashes).
'jam'+'jar'='JAMJAR'
'for' is the link.
Can you help me to learn more?
(Other definitions for jamjar that I've seen before include "London Transport?" , "Vessel" , "Glass container" , "Container for conserve" , "Container for preserve" .)