Glass container in Cockney's car (3,3)
I believe the answer is:
jam jar
'cockney's car' is the definition.
I know nothing about this answer so I can't judge whether this works.
'glass container' is the wordplay.
'glass' becomes 'jam' (I can't explain this - if you can you should give a lot more credence to this answer).
'container' becomes 'jar' (jar is a kind of container).
'jam'+'jar'='JAM JAR'
'in' is the link.
Can you help me to learn more?
(Other definitions for jam jar that I've seen before include "Container for preserve" , "Container for conserve" .)