Crossword Genius

One form of eternity (3)

Ross

I believe the answer is:

eon

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

'one form' is the wordplay.
'form' is an anagram indicator.
'one' anagrammed gives 'EON'.

'of' acts as a link.

(Other definitions for eon that I've seen before include "Very long age" , "Major division of geological time" , "Huge time period" , "thousand million years" , "Prolonged period" .)

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