Simple and effective coat of polish for grand trunk -- and its owner? (8)
I believe the answer is:
elephant
'simple' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for elephant that I've seen before include "See 18" , "Trunked mammal" , "Pachyderm hunted for ivory" , "Jumbo" , "it's said to have lots of memory" .)