### Clue: Doctor accepts first Ugandan order for elephant cleaning system (3,4)
### Answer: MUD BATH 
 ### Explanation: Definition: elephant cleaning system
 MD(abbrev. for the Latin "Medicinae Doctor", a Doctor of Medicine) **containing**(accepts) **1st letter of**(first) "Ugandan" + BATH(reference to the Most Honourable Order of the Bath, bathing being a part of the ceremony for conferring knighthoods).
Elephants, warthogs and humans do it: