Time in another age (3)
I believe the answer is:
era
'time' is the definition.
(an era is a period of time)
'in another age' is the wordplay.
'in' indicates a hidden word.
'ERA' is hidden in the letters of 'another age'.
(Other definitions for era that I've seen before include "Geological period" , "Cycle" , "Aeon" , "Are involved in time span" , "Long historic period" .)