Time in moderation (3)
I believe the answer is:
era
'time' is the definition.
(era is a kind of time)
'in moderation' is the wordplay.
'in' indicates a hidden word.
'ERA' can be found hidden inside 'moderation'.
(Other definitions for era that I've seen before include "Important date" , "Series of years" , "Geological age" , "generation, maybe" , "Significant time" .)