Old string caught a book? (7)
I believe the answer is:
rebecca
'book?' is the definition.
(Daphne du Maurier novel)
'old string caught a' is the wordplay.
'old string' becomes 'rebec' (I can't justify this - if you can you should give a lot more credence to this answer).
'caught' becomes 'c' (cricket abbreviation).
'rebec'+'c'+'a'='REBECCA'
Can you help me to learn more?
(Other definitions for rebecca that I've seen before include "She married Maxim first" , "Daphne du Maurier novel; girl's name" , "Du Maurier novel - Hitchcock thriller" , "Biblical wife of Isaac and mother of Jacob and Esau" , "she loved Ivanhoe" .)