Restoration novel with authentic covers (7)
I believe the answer is:
renewal
'restoration' is the definition.
(I know that renewal is a type of restoration)
'novel with authentic covers' is the wordplay.
'novel' becomes 'new' (novel means new or fresh).
'with authentic' becomes 'real' (authentic means real or genuine. I am not sure about the 'with' bit.).
'covers' means one lot of letters goes inside another.
'new' put into 'real' is 'RENEWAL'.
Can you help me to learn more?
(Other definitions for renewal that I've seen before include "Repair" , "extension of loan period" , "Replacement" , "Replenishment" , "one of the library's services" .)