Crossword Genius

Form a cylindrical shape (4,2)

Ross

I believe the answer is:

roll up

(Other definitions for roll up that I've seen before include "Fairground barker's exhortation" , "Home-made cigarette" , "Invitation to come" , "Appear" , "Salesman's cry" .)

I've seen this clue in The Daily Mail and The Mirror.
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