Crossword Genius

Posh car that might be stuck in Barnet (6)

Ross

I believe the answer is:

roller

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'posh car' is the definition.
(abbreviation for Rolls Royce)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for roller that I've seen before include "Big wave or hair setter" , "Heavy sea wave and hair curler" , "Swelling wave; bird" , "A large wave or a hair shaper" , "sort of blind" .)

I've seen this clue in The Times.
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