Container causing a traffic problem and a shock (3,3)
I believe the answer is:
jam jar
'container causing a traffic' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'problem and a shock' is the wordplay.
'problem' becomes 'jam' (I've seen this before).
'and' means one lot of letters go next to another.
'a shock' becomes 'jar' (I've seen this before).
'jam'+'jar'='JAM JAR'
Can you help me to learn more?
(Other definitions for jam jar that I've seen before include "Container for conserve" , "Container for preserve" .)