Good book for a fellow with a small sister (7)
I believe the answer is:
genesis
'good book' is the definition.
'genesis' can be an answer for 'book' (I've seen this before). I'm not sure about the 'good' bit.
'a fellow with a small sister' is the wordplay.
'a fellow with' becomes 'gene' (I am not sure about this - if you are sure you should believe this answer much more).
'a small sister' becomes 'sis' (synonyms; 'small' asks for an abbreviation).
'gene'+'sis'='GENESIS'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for genesis that I've seen before include "Beginning (in the Bible)" , "First book of the Old Testament" , "Birth, beginnings" , "the start of something" , "Beginning the holy book" .)