Crossword Genius

Glass container in Cockney's car (3,3)

Ross

I believe the answer is:

jam jar

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

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