Crossword Genius

Change as one ages (5)

Ross

I believe the answer is:

aeons

'ages' is the definition.
(aeon is a kind of age)

'change as one' is the wordplay.
'change' indicates anagramming the letters.
'as'+'one'='asone'
'asone' with letters rearranged gives 'AEONS'.

(Other definitions for aeons that I've seen before include "Long periods of time" , "Vast ages" .)

I've seen this clue in The Telegraph.
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