Reference book has uterus misspelled (9)
I believe the answer is:
thesaurus
'reference book' is the definition.
(I know that thesaurus is a type of wordbook)
'has uterus misspelled' is the wordplay.
'misspelled' indicates anagramming the letters (I've seen this in other clues).
'has'+'uterus'='hasuterus'
'hasuterus' with letters rearranged gives 'THESAURUS'.
(Other definitions for thesaurus that I've seen before include "Reference book" , "treasury" , "lists?" , "work we may refer to" , "Book of words with synonyms, antonyms etc" .)