Same novel under new titles (5)
I believe the answer is:
names
'titles' is the definition.
(I've seen this before)
'same novel under new' is the wordplay.
'novel' indicates an anagram.
'under' means one lot of letters go next to another.
'new' becomes 'n'.
'same' anagrammed gives 'ames'.
'ames' after 'n' is 'NAMES'.
(Other definitions for names that I've seen before include "Heroes" , "Some people drop these to sound important" , "Titles" , "Appellations or identifiers" , "People and things are known by them" .)