Crossword Genius

Flipping East End pastime includes nothing rough (5)

Ross

I believe the answer is:

yobbo

'rough' is the definition.

I cannot understand how the remainder of the clue works.

(Other definitions for yobbo that I've seen before include "Young troublemaker" , "rough type" , "Surly youth" , "Hooligan" , "Arrive" .)

I've seen this clue in The Guardian.
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