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Stage of culture one runs on maturity (4,3)

Ross

I believe the answer is:

iron age

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

'stage of culture' is the definition.
The definition and answer can be both related to time as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

'one runs on maturity' is the wordplay.
'one' becomes 'I' (Roman numeral).
'runs' becomes 'r' (cricket abbreviation).
'maturity' becomes 'age' (I've seen this before).
'i'+'r'+'on'+'age'='IRON AGE'

Can you help me to learn more?

(Other definitions for iron age that I've seen before include "Time of the spread of metal weapons, tools etc" , "Prehistoric period" , "Ancient period in the development of mankind" , "A region (anag) - period long ago" , "Period in the history of man - a region (anag)" .)

I've seen this clue in the Sydney Morning Herald.
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