Uses baby talk in two books, amongst loads of wool (7)
I believe the answer is:
babbles
'uses baby talk in two' is the definition.
I can't judge whether this definition defines the answer.
'books amongst loads of wool' is the wordplay.
'books' becomes 'bb' (two abbreviations for book).
'amongst' indicates putting letters inside (I've seen this in other clues).
'loads of wool' becomes 'bales' (I can't justify this - if you can you should give a lot more credence to this answer).
'bb' inserted into 'bales' is 'BABBLES'.
Can you help me to learn more?
(Other definitions for babbles that I've seen before include "Talks incessantly" , "Prattles" .)