Archaeological period (4,3)
'archaeological period' is the definition.
(I've seen this before)
This is all the clue.
'archaeological period' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for iron age that I've seen before include "Archaeological period" , "bygone era" , "prehistoric times" , "historical period" , "Hist. cultural stage" .)