### Clue: Finally changing sides, US president establishing trade body (6)
### Answer: CARTEL 
 ### Explanation: Definition: trade body
  Carter(Jimmy, the peanut farmer former US president) with last letter(finally) "r",$$r$$ight **replaced by** "$$l$$",left(changing sides)
Defn:  A gang,body of commercial/trade organisations who decide on collective action to further their interests and almost always regardless of, or at, additional expense to their clients/customers, eg. OPEC (Organisation of Petroleum Exporting Countries).