Polish black eye? (6)

I believe the answer is:

shiner

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

'eye?' is the definition.
(I have seen 'Black eye' mean 'shiner' so perhaps 'eye' could also mean 'shiner')

'polish black' is the wordplay.
'polish' becomes 'shine' (synonyms).
'black' becomes 'r' (I can't explain this - if you can you should give a lot more credence to this answer).
'shine'+'r'='SHINER'

Can you help me to learn more?

(Other definitions for shiner that I've seen before include "Informal black eye - see how it glows" , "Informally, a black eye" , "Mouse" , "Star" , "Her sin (anag)" .)

I've seen this clue in the Sydney Morning Herald.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.