Roman summer resort of note (first book in series) (6)
I believe the answer is:
tivoli
'roman summer resort' is the definition.
(city used as a summer resort in ancient Rome)
'note first book in series' is the wordplay.
'note' becomes 'ti' (musical note as in do re mi so fa la ti).
'first book in series' becomes 'Vol I' (Vol 1, the first volume).
'ti'+'voli'='TIVOLI'
'of' is the link.
(Other definitions for tivoli that I've seen before include "Pleasure garden in Copenhagen" , "Town near Rome; gardens in Copenhagen" , "Site of the Villa d'Este" , "old Italian town" , "Copenhagen park" .)