Crossword Genius

Cosmos; an anaesthetic (5)

Ross

I believe the answer is:

ether

I believe this is a double definition.

'cosmos' is the first definition.
(I've seen this in another clue)

'an anaesthetic' is the second definition.
(ether is a kind of anaesthetic)

(Other definitions for ether that I've seen before include "An early anaesthetic" , "Rare atmosphere" , "Type of chemical" , "Old anaesthetic -- three (anag)" , "Anaesthetic is, strangely, there" .)

I've seen this clue in the Sydney Morning Herald.
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