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' indicates an anagram.
'title' with letters rearranged gives '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" .)