Second book for Mafiosi (3)
I believe the answer is:
mob
'mafiosi' is the definition.
(I've seen this before)
'second book' is the wordplay.
'second' becomes 'mo' (both are short periods of time).
'book' becomes 'b' (abbreviation for book).
'mo'+'b'='MOB'
'for' is the link.
(Other definitions for mob that I've seen before include "Rabble" , "Unruly crowd" , "Throng" , "Rowdy crowd" , "Mafiosi" .)