Take part in Silent Era (5)
I believe the answer is:
enter
'take part' is the definition.
(as in entering a competition)
'in silent era' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ENTER' can be found hidden inside 'silent era'.
(Other definitions for enter that I've seen before include "Inscribe" , "submit?" , "Come/go in" , "Gain admission" , "Go in and put in the ledger" .)