Onetime dentist's supply (5)

I believe the answer is:

ether

(Other definitions for ether that I've seen before include "The gas is there, oddly" , "Liquid used as anaesthetic/ solvent" , "Solvent; clear sky (poet.)" , "There goes the anaesthetic" , "Old anaesthetic -- three (anag)" .)

I've seen this clue in The New York Times.

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