Time of importance (6)
I believe this is a double definition.
'time' is the first definition.
(I know that moment is a type of time)
'importance' is the second definition.
(I know that moment is a type of significance)
'of' is the link.
(Other definitions for moment that I've seen before include "An instant in time - important" , "Second, importance" , "The present Maureen intended, we hear" , "tick" , "A very brief portion of time" .)
'time of importance' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for era that I've seen before include "Eon" , "Stage" , "Distinctive period of time" , "8" , "Geological age" .)