Small library's first new title (6)
I believe the answer is:
little
'small' is the definition.
(I know that small can be written as little)
'library's first new title' is the wordplay.
'library's first' becomes 'l' (1st letter of 'library').
'new' is an anagram indicator.
'title' is an anagram of 'ittle'.
'l'+'ittle'='LITTLE'
(Other definitions for little that I've seen before include "` `...... pitchers have big ears' '" , "(Heroine of) Dickens novel" , "petty" , "Minor" , "'Every ...... helps" .)