In general, a long time (3)

I believe the answer is:

era

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

'in general a' is the wordplay.
'in' indicates a hidden word.
'ERA' is hidden within 'general a'.

(Other definitions for era that I've seen before include "Long period of history" , "Series of years" , "Geological period" , "Memorable period" , "Distinct period in history" .)

I've seen this clue in the Evening Standard.

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