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Buffet cars inter alia currently serving rich gravy (7,5)

Ross

I believe the answer is:

rolling stock

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'buffet cars inter alia currently' is the definition.
I can't tell whether this defines the answer.

'rich gravy' is the wordplay.
'rich' becomes 'rolling' (rolling in it).
'gravy' becomes 'stock' (I can't explain this - if you can you should give a lot more credence to this answer).
'rolling'+'stock'='ROLLING-STOCK'

'serving' acts as a link.

Can you help me to learn more?

(Other definitions for rolling stock that I've seen before include "Railway wagons" , "Railway vehicles" , "Rail vehicles" , "Locomotives and coaches" , "Locomotives, carriages etc" .)

I've seen this clue in The Times.
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