Creativity in book covers of Tolstoy (7)
I believe the answer is:
novelty
'creativity' is the definition.
(novelty is a kind of creativity)
'book covers of tolstoy' is the wordplay.
'book' becomes 'novel' (novel is a kind of book).
'covers of' means to remove the middle letters.
'tolstoy' with its middle taken out is 'ty'.
'novel'+'ty'='NOVELTY'
'in' is the link.
(Other definitions for novelty that I've seen before include "Unfamiliar thing" , "Middle-Eastern language" , "Innovation" , "Inexpensive toy" , "New thing" .)