Synonym books, article mother leaves Japanese warrior with (8)
I believe the answer is:
thesauri
'synonym books' is the definition.
'thesauri' can be an answer for 'books' (thesaurus is a kind of book). I am unsure of the 'synonym' bit.
'article mother leaves japanese warrior with' is the wordplay.
I cannot quite see how this works, but
'article' could be 'the' (the 'definite article' part of speech) and 'the' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for thesauri that I've seen before include "Dictionaries" , "Word founts" , "References" , "they may aid writers" , "Reference works providing synonyms" .)