Crossword Genius

Etcher's need (4)

Ross

I believe the answer is:

'etcher's need' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for acid that I've seen before include "Caustic and biting" , "Sarcastic - tart" , "Bitter substance" , "Substance which turns litmus red" , "something sharp" .)

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