wrong 'un

noun3

1. •
   (slang, disapproving) A dishonest or disreputable person; a crook or rogue.

   • Some reasons why Naseem Hamed might have been stripped of his MBE for speeding, where acknowledged wrong 'uns Jeffrey Archer, Shirley Porter and Mark Thatcher kept their honours. — 2007
2. •
   A googly.
3. •
   A horse deliberately held back in order to lose a race.