Long time inside after attacks (3)

I believe the answer is:

era

'long time' is the definition.
(a long period of time)

'inside after attacks' is the wordplay.
'inside' indicates the answer is hidden within the clue.
'ERA' is hidden within 'after attacks'.

(Other definitions for era that I've seen before include "Period, age" , "Long historic period" , "US equality law" , "day" , "Geological period" .)

I've seen this clue in The Telegraph and The Sun.

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