Press one's years in a period BC (4,3)
I believe the answer is:
iron age
'a period bc' is the definition.
The definition and answer can be both related to time as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'press one's years' is the wordplay.
'press' becomes 'iron' (ironing is a kind of pressing).
'one's years' becomes 'age'.
'iron'+'age'='IRON AGE'
'in' is the link.
Can you help me to learn more?
(Other definitions for iron age that I've seen before include "historical period" , "Archaeological period" , "A region (anag) - period long ago" , "Period from about 1100 BC" , "Time of the spread of metal weapons, tools etc" .)