Modern culture has endless requirement to accommodate witty person (3,3)
I believe the answer is:
new age
'modern culture' is the definition.
The definition suggests a singular noun which matches the answer.
'endless requirement to accommodate witty person' is the wordplay.
'endless' means to remove the last letter.
'requirement' becomes 'need' (synonyms).
'to accommodate' is an insertion indicator.
'witty person' becomes 'wag' (wag is a kind of person. I am not sure about the 'witty' bit.).
'need' with its final letter taken away is 'nee'.
'nee' placed around 'wag' is 'NEW-AGE'.
'has' is the link.
Can you help me to learn more?
(Other definitions for new age that I've seen before include "Modern holistic philosophy" , "Of a movement based on alternatives to traditional ideas of Western culture" , "That's very spiritual" , "Modern movement" , "Modern cultural trend" .)