Book month before summer in Paris (permit included) (9)
I believe the answer is:
novelette
'book' is the definition.
(I've seen this before)
'month before summer in paris permit included' is the wordplay.
'month' becomes 'nov' (abbreviation for November).
'before' says to put letters next to each other.
'summer in paris' becomes 'ete' (').
'permit' becomes 'let' (synonyms).
'included' is an insertion indicator.
'ete' enclosing 'let' is 'elette'.
'nov'+'elette'='NOVELETTE'
(Other definitions for novelette that I've seen before include "Short work of fiction" , "Short and light tale" , "Short story" , "romance?" , "Short book of fiction" .)