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I shout, taking on olden days (4,3)

Ross

I believe the answer is:

iron age

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But I can't explain it at all! Could you help me understand?

(Other definitions for iron age that I've seen before include "Time of the spread of metal weapons, tools etc" , "Period when metal tools were developed" , "Prehistoric period" , "Period in the history of man - a region (anag)" , "historical period" .)

I've seen this clue in The Mirror.
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