Writer's helper that man has in house (9)
I believe the answer is:
thesaurus
'writer's helper' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'man has in house' is the wordplay.
'man has' becomes 'hes' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'house' becomes 'taurus' (Taurus is an example).
'hes' put inside 'taurus' is 'THESAURUS'.
'that' acts as a link.
Can you help me to learn more?
(Other definitions for thesaurus that I've seen before include "Reference book" , "Dictionary" , "Book listing synonyms" , "Wordy book" , "Wordbook" .)