Crossword Genius

Safety feature of sandwich counter (7)

Ross

I believe the answer is:

rollbar

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'safety feature' is the definition.
The definition suggests a singular noun which matches the answer.

'sandwich counter' is the wordplay.
'sandwich' becomes 'roll' (I am not sure about this - if you are sure you should believe this answer much more).
'counter' becomes 'bar' (bar is a kind of counter).
'roll'+'bar'='ROLLBAR'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for rollbar that I've seen before include "Protection if car overturns" , "Sports car safety device" , "Safety frame used on motor sport vehicles" , "Maybe one resisting turnover" , "protection for drivers" .)

I've seen this clue in The Independent.
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