Crossword Genius

One worked for some time (3)

Ross

I believe the answer is:

eon

'some time' is the definition.
(eon is a kind of time)

'one worked' is the wordplay.
'worked' indicates anagramming the letters.
'one' with letters rearranged gives 'EON'.

'for' acts as a link.

(Other definitions for eon that I've seen before include "billion years" , "In time, long division" , "Prolonged period" , "Vast period" , "Immense period" .)

I've seen this clue in The Mirror.
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