Crossword Genius

Old number?

Ross

I believe the answer is:

'old number?' is the definition.
(chemical historically used to numb patients)

This is the entire clue.

(Other definitions for ether that I've seen before include "Colourless liquid used as a solvent" , "Imaginary interstellar medium" , "It could knock you out" , "Chemical solvent" , "Volatile organic liquid once used as a general anaesthetic" .)

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