### Clue: South African animal knocking over a drink with approval (6)
### Answer: REEBOK 
 ### Explanation: Definition: South African animal
  **Reversal of**(knocking over) BEER(a drink) **plus**(with) OK(the okay,approval). 
Answer: A South African antelope, from Afrikaans from Dutch for "roebuck".  The animal's association with speed inspired the naming of that line of running shoes.