Crossword Genius

Barker's call for a cigarette (4-2)

Ross

I believe the answer is:

roll up

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'cigarette' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for roll up that I've seen before include "Home-made cigarette" , "Appear" , "smoke" , "Fairground barker's exhortation" , "Arrive -- handmade cigarette (4,2;4-2)" .)

I've seen this clue in The Guardian.
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