Crossword Genius

Burn boat after king's left (4)

Ross

I believe the answer is:

etch

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'burn' is the definition.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for etch that I've seen before include "Wear away by chemical reaction" , "Engrave deeply" , "Carve or engrave into surface" , "Engrave (metal, glass etc.)" , "Cut using sharp instrument" .)

I've seen this clue in The Telegraph.
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