Period in history of a region (7)

I believe the answer is:

ironage

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'period in history' is the definition.
The definition suggests a singular noun which matches the answer.

'of a region' is the wordplay.
'of' indicates an anagram (the answer comes from or 'of' the letters).
'a'+'region'='aregion'
'aregion' anagrammed gives 'IRONAGE'.

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I've seen this clue in The Irish Independent.

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