Onetime anesthetic (5)

I believe the answer is:

ether

'onetime anesthetic' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ether that I've seen before include "Gas - air - space" , "I'm volatile" , "Formerly an anaesthetic" , "Colourless volatile highly inflammable liquid" , "Type of chemical" .)

I've seen this clue in the USA Today and the Newsday.

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