Very good book about Newton - though I wouldn’t think it would do for you! (4)
I believe the answer is:
snob
'i wouldn't think it would do for you' is the definition.
I can't judge whether this defines the answer.
'very good book about newton' is the wordplay.
'very good' becomes 'so' (as in the adjectival form 'just so!').
'book' becomes 'b' (abbreviation for book).
'about' means one lot of letters goes inside another.
'newton' becomes 'N' (symbol for the scientific unit of force).
'so'+'b'='sob'
'sob' going around 'n' is 'SNOB'.
'though' acts as a link.
Can you help me to learn more?
(Other definitions for snob that I've seen before include "who puts on airs" , "Prig" , "One for whom social status matters" , "Crispin" , "Toffee-nose" .)