Crossword Genius

Painter’s forename, you’ll infer, always missing first three letters (9)

Ross

I believe the answer is:

enameller

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'letters' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?

I don't understand the rest of the clue.

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(Other definitions for enameller that I've seen before include "One decorating with glassy coatings" , "One applying vitrified coating" , "Who lacquers" , "Decorative artist" , "Craftsman" .)

I've seen this clue in The Times.
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