Crossword Genius

Old number three sent off (5)

Ross

I believe the answer is:

ether

(Other definitions for ether that I've seen before include "Anaesthetic is, strangely, there" , "Gas - air - space" , "Solvent; clear sky (poet.)" , "Volatile organic liquid once used as a general anaesthetic" , "Chemical solvent" .)

I've seen this clue in The Sun.
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