Creativity in books by youth leader about free love (7)
I believe the answer is:
novelty
'creativity' is the definition.
(novelty is a kind of creativity)
'books by youth leader about free love' is the wordplay.
'books' becomes 'nt' (abbreviation for New Testament).
'by' says to put letters next to each other.
'leader' says to take the initial letters.
'about' indicates putting letters inside.
'free' is an anagram indicator.
The initial letter of 'youth' is 'y'.
'nt'+'y'='nty'
'love' with letters rearranged gives 'ovel'.
'nty' enclosing 'ovel' is 'NOVELTY'.
'in' is the link.
(Other definitions for novelty that I've seen before include "Something new and unusual" , "New thing" , "Middle-Eastern language" , "Small, inexpensive, unusual article" , "Freshness" .)