Crossword Genius

In there, you can find a source of oblivion (5)

Ross

I believe the answer is:

ether

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

'source of oblivion' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?

'in there you can find a' is the wordplay.
'there' can be anagrammed to 'ETHER'.
Though, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for ether that I've seen before include "Old anaesthetic -- three (anag)" , "Rare atmosphere" , "There goes the anaesthetic" , "Some were put out by this" , "Former anaesthetic" .)

I've seen this clue in the Evening Standard.
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