Crossword Genius

Simple and effective coat of polish for grand trunk -- and its owner? (8)

Ross

I believe the answer is:

elephant

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Telegraph.
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