Extend stubby limb and ring for car (7,4)
I believe the answer is:
stretch limo
'ring for car' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'extend stubby limb' is the wordplay.
'extend' becomes 'stretch' (stretching is a kind of extending).
'stubby limb' becomes 'limo' (I can't explain this - if you can you should give a lot more credence to this answer).
'stretch'+'limo'='STRETCH LIMO'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for stretch limo that I've seen before include "Long vehicle" , "Large luxury car" , "motor" , "Very long car" .)