Short novel ending with a new title (6)
I believe the answer is:
little
'short' is the definition.
('little' can be similar in meaning to 'short')
'novel ending with a new title' is the wordplay.
'ending' indicates one should take the final letters.
'with' means one lot of letters go next to another.
'a new' indicates an anagram.
The last letter of 'novel' is 'l'.
'title' anagrammed gives 'ittle'.
'l'+'ittle'='LITTLE'
(Other definitions for little that I've seen before include "Jobsworth?" , "'Every ...... helps" , "Small in size or amount" , "(Heroine of) Dickens novel" , "Pinkie" .)