Time of endless dry wit -- a good experience at first (4,3)
I believe the answer is:
iron age
'time' is the definition.
The definition and answer can be both related to time as well as being singular nouns.
Maybe there's an association between them I don't understand?
'endless dry wit a good experience at first' is the wordplay.
'endless' means to remove the last letter.
'dry wit' becomes 'irony' (I've seen this before).
'a good' becomes 'ag' (I've seen this in other clues).
'at first' says to take the initial letters.
The first letter of 'experience' is 'e'.
'irony' with its final letter taken away is 'iron'.
'iron'+'ag'+'e'='IRON AGE'
'of' is the link.
Can you help me to learn more?
(Other definitions for iron age that I've seen before include "prehistoric times" , "bygone era" , "Archaeological period" , "Time of the spread of metal weapons, tools etc" , "Period when metal tools were developed" .)