Crossword Genius

Three is an odd number (5)

Ross

I believe the answer is:

ether

I'm a little stuck... Click here to teach me more about this clue!

'number' is the definition.
(anaesthetic, something which numbs)

'three is an odd' is the wordplay.
'three' can be anagrammed to 'ETHER'.
However, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for ether that I've seen before include "Anaesthetic; clear sky (poetic)" , "Volatile solvent" , "Imaginary interstellar medium" , "The gas is there, oddly" , "Colourless volatile highly inflammable liquid" .)

I've seen this clue in The Globe and Mail.
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