Age immediately following prohibition era in US (6-3)
I believe the answer is:
twenty-one
'age immediately following prohibition era' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'us' is the wordplay.
I cannot quite understand how this works, but
'us' could be 'we' and 'we' is located in the answer.
This explanation may well be incorrect...
'in' acts as a link.
Can you help me to learn more?
(Other definitions for twenty-one that I've seen before include "Card game, blackjack or pontoon" , "XXI - used to be the coming of age year" , "Target total in blackjack or pontoon" .)