Crossword Genius

Crown topper (6)

Ross

I believe the answer is:

enamel

'crown topper' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for enamel that I've seen before include "Hard shiny coating as on teeth" , "Hard shiny surface as on teeth" , "Smooth hard paint" , "hard cover" , "protective coat" .)

I've seen this clue in the LA Times and The New York Times.
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