Traveller not going back to school at Derby (6)

(Source: London Evening Standard)

General meaning ⇒ a school in Derby, or Derbyshire

"traveller" ⇒ a representative ⇒ usually shortened to "rep"

"not going back" ⇒ "not" reversed ⇒ "ton"

Answer ⇒ Repton [more info]