Crossword Genius

Sort of writing that may be highly polished (11)

Ross

I believe the answer is:

copperplate

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'sort of writing' is the definition.

I don't understand the rest of the clue.

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(Other definitions for copperplate that I've seen before include "Ornate writing" , "sort of hand" , "good hand" , "hand: that's fine" .)

I've seen this clue in The Globe and Mail.
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