Crossword Genius

Yob left, excluded (4)

Ross

I believe the answer is:

lout

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'yob' is the definition.
(both can mean an antisocial young man)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for lout that I've seen before include "Boor, roughneck" , "Yahoo" , "Lob" , "Boor, oaf" , "Ill-mannered or aggressive man" .)

I've seen this clue in The Sun.
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