Historical period (3)
'historical period' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for era that I've seen before include "Distinct period in history" , "Period, age" , "Specific time" , "Period of alteration" , "generation, maybe" .)
'historical period' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for age that I've seen before include "Very long time" , "Mature, grow in years" , "Period of history" , "Years since birth" , "Length of life" .)
'historical period' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for epoch that I've seen before include "Distinctive period of time" , "Making this date" , "Significant period" , "Historical period" , "A particular period of history" .)