Book that chap's taken into house (9)
I believe the answer is:
thesaurus
'book' is the definition.
(thesaurus is a kind of book)
'chap's taken into house' is the wordplay.
'chap's' becomes 'he's'.
'taken into' indicates putting letters inside.
'house' becomes 'taurus' (Taurus is an example).
'hes' inserted into 'taurus' is 'THESAURUS'.
'that' is the link.
(Other definitions for thesaurus that I've seen before include "treasury" , "Wordy gathering" , "work we may refer to" , "storehouse" , "Word book" .)