Form a cylindrical shape (4,2)

I think it could be either:

Which length description are you looking for?:

4,2

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 Mirror and The Daily Mail.

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