Period pieces are recalled (3)

I believe the answer is:

era

I'm a little stuck... Click here to teach me more about this clue!

'period' is the definition.
(I know that era is a type of period)

'pieces are recalled' is the wordplay.
'are' can be anagrammed to 'ERA'.
Though, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for era that I've seen before include "US equality law" , "Period, age" , "Eon" , "Characteristic period" , "generation, maybe" .)

I've seen this clue in The Irish Times.

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