Crossword Genius

Cost of polish, not good (4)

Ross

I believe the answer is:

loss

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'cost' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for loss that I've seen before include "Forgetting" , "One may be missed" , "Forfeiture" , "Destruction" , "Defeat (in sport)" .)

I've seen this clue in The Times.
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