Teamed up with yob from Old Bailey (6)

I believe the answer is:

allied

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'teamed' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for allied that I've seen before include "Owl's cry" , "Joined by treaty or agreement" , "Joined together for mutual support" , "Joined in friendship, treaty, etc" , "Joined to, combined with" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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