Engrave with acid (4)

I believe the answer is:

etch

'engrave with acid' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for etch that I've seen before include "Make carvings" , "Cut; engrave" , "Engrave (metal, glass etc.)" , "Design on metal or glass using acid" , "Wear away by chemical reaction" .)

I've seen this clue in the Newsday, the Universal, The Guardian, The Sun, The Star Tribune and The Times.

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