Crossword Genius

European working a very long time (3)

Ross

I believe the answer is:

eon

'a very long time' is the definition.
(I've seen this before)

'european working' is the wordplay.
'european' becomes 'e' (abbreviation e.g. EU).
'working' becomes 'on'.
'e'+'on'='EON'

(Other definitions for eon that I've seen before include "An immense time" , "Geological period" , "Major division of geological time" , "billion years" , "Age, epoch" .)

I've seen this clue in The Telegraph.
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