Maybe three can put you to sleep (5)

I believe the answer is:

ether

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

'put you to sleep' is the definition.
I can't tell whether this definition defines the answer.

'maybe three' is the wordplay.
'maybe' indicates anagramming the letters.
'three' anagrammed gives 'ETHER'.

'can' acts as a link.

Can you help me to learn more?

(Other definitions for ether that I've seen before include "Old anaesthetic -- three (anag)" , "Medium supposedly" , "The gas is there, oddly" , "Liquid used as anaesthetic/ solvent" , "Anaesthetic; clear sky (poetic)" .)

I've seen this clue in the Evening Standard.

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